OFFSET
1,1
COMMENTS
In the definition one can take y=1. Thus the sequence becomes the number of terms in the polynomial of the product{k=0..n} (1-x^T_i), where G_i is the i-th triangular number.
MATHEMATICA
f[n_] := Length@ ExpandAll@ Product[1 - x^(k (k + 1)/2), {k, n}]; Array[f, 50]
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, May 12 2013
STATUS
approved