# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a127773 Showing 1-1 of 1 %I A127773 #8 Jun 13 2014 11:50:37 %S A127773 1,0,3,0,0,6,0,0,0,10,0,0,0,0,15,0,0,0,0,0,21,0,0,0,0,0,0,28,0,0,0,0, %T A127773 0,0,0,36,0,0,0,0,0,0,0,0,45,0,0,0,0,0,0,0,0,0,55 %N A127773 Triangle read by rows: row n consists of n-1 zeros followed by n(n+1)/2. %e A127773 First few rows of the triangle are: %e A127773 1; %e A127773 0, 3; %e A127773 0, 0, 6; %e A127773 0, 0, 0, 10; %e A127773 0, 0, 0, 0, 15; %e A127773 ... %t A127773 Flatten[Table[{(n(n+1))/2,Table[0,{n}]},{n,10}]] (* _Harvey P. Dale_, Apr 03 2011 *) %Y A127773 Cf. A127648, A000217, A127774. %K A127773 nonn,easy,tabl %O A127773 1,3 %A A127773 _Gary W. Adamson_, Jan 28 2007 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE