OFFSET
1,7
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..1350 (rows 1..20)
EXAMPLE
Triangle begins:
[1] 1;
[2] 0, 0;
[3] 0, 0, 0, 2;
[4] 0, 0, 0, 0, 6, 36, 24;
[5] 0, 0, 0, 0, 0, 24, 480, 1940, 2970, 2040, 544;
...
PROG
(PARI)
OrientedGgf(n, y=1) = {sum(k=0, n, ((1+2*y)/(1+y))^(k*(k-1)/2)*x^k/k!, O(x*x^n) )}
StrongO(n, y=1) = {my(g=serconvol(1/OrientedGgf(n, y), sum(k=0, n, x^k*(1+y)^(k*(k-1)/2), O(x*x^n)))); Vec(serlaplace(-log(g)))}
row(n)={Vecrev(StrongO(n, 'y)[n], n*(n-1)/2+1)}
{ for(n=1, 6, print(row(n))) }
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Andrew Howroyd, Jan 11 2022
STATUS
approved