OFFSET
0,3
LINKS
Robert Israel, Table of n, a(n) for n = 0..1999
FORMULA
Empirical g.f.: (1-x^2)^2/((1+x-x^2)*(1-x-x^2)^2). - Robert Israel, Mar 02 2018
EXAMPLE
a(4) = 10 = sum of row 4 terms of triangle A134511: (5 + 0 + 4 + 0 + 1).
MAPLE
N:= 100: # for the first N terms
T128174:= Matrix(N, N, (i, j) -> `if`(j<=i, (i-j+1) mod 2, 0)):
T049310:= Matrix(N, N):
for i from 1 to N do
P:= orthopoly[U](i-1, x/2);
for j from 1 to i do
T049310[i, j]:= abs(coeff(P, x, j-1))
od
od:
convert(T049310 . (T128174 . Vector(N, 1)), list); # Robert Israel, Mar 02 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Gary W. Adamson, Oct 28 2007
EXTENSIONS
More terms from Robert Israel, Mar 02 2018
STATUS
approved