# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a367023 Showing 1-1 of 1 %I A367023 #14 Nov 22 2023 12:19:27 %S A367023 1,1,1,1,3,2,1,6,12,5,1,10,40,50,14,1,15,100,250,210,42,1,21,210,875, %T A367023 1470,882,132,1,28,392,2450,6860,8232,3696,429,1,36,672,5880,24696, %U A367023 49392,44352,15444,1430,1,45,1080,12600,74088,222264,332640,231660,64350,4862 %N A367023 Triangle read by rows, T(n, k) = [x^k] p(n), where p(n) = hypergeom([1/2, -n - 1, -n], [2, 2], 4*x). %F A367023 T(2*n, n) = Sum_{k=0..n} CatalanNumber(n)^2 * binomial(n + k, k). %F A367023 From _Detlef Meya_, Nov 22 2023: (Start) %F A367023 T(n, k) = binomial(n, k)*binomial(n+1, k)*binomial(2*k, k)/(k+1)^2. %F A367023 T(n, k) = A001263(n+1, k+1)*binomial(2*k, k)/(k+1). (End) %e A367023 Triangle T(n, k) starts: %e A367023 [0] 1; %e A367023 [1] 1, 1; %e A367023 [2] 1, 3, 2; %e A367023 [3] 1, 6, 12, 5; %e A367023 [4] 1, 10, 40, 50, 14; %e A367023 [5] 1, 15, 100, 250, 210, 42; %e A367023 [6] 1, 21, 210, 875, 1470, 882, 132; %e A367023 [7] 1, 28, 392, 2450, 6860, 8232, 3696, 429; %e A367023 [8] 1, 36, 672, 5880, 24696, 49392, 44352, 15444, 1430; %e A367023 [9] 1, 45, 1080, 12600, 74088, 222264, 332640, 231660, 64350, 4862; %p A367023 p := n -> hypergeom([1/2, -n - 1, -n], [2, 2], 4*x): %p A367023 T := (n, k) -> coeff(simplify(p(n)), x, k): %p A367023 seq(seq(T(n, k), k = 0..n), n = 0..9); %t A367023 T[n_,k_]:=Binomial[n,k]*Binomial[n+1,k]*Binomial[2*k,k]/(k+1)^2;Flatten[Table[T[n,k],{n,0,9},{k,0,n}]] %t A367023 (* _Detlef Meya_, Nov 22 2023 *) %Y A367023 Cf. A128088 (row sums), A358368 (central terms), A367022. %K A367023 nonn,tabl %O A367023 0,5 %A A367023 _Peter Luschny_, Nov 06 2023 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE