OFFSET
0,5
COMMENTS
Also equals (with offset) the row sums and rightmost border of triangle A132784.
PROG
(PARI) {a(n)=local(A=[1]); if(n==0, 1, for(i=1, n, B=Vec(Pol(A)/(1-x +x*O(x^(i*(i-1)/2)))); A=concat(vector(i), B)); A[n+1])}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Aug 29 2007
STATUS
approved