A304857 a(n) = A304400(n) / n^2 for n >= 1.

1, 2, 17, 296, 8205, 322412, 16861408, 1129044208, 94262593881, 9617095872812, 1179417144559337, 171422055924510232, 29164680268271517644, 5744954740594875376712, 1297633915706481674014856, 333220154688593666676579264, 96542160783658837442386115393, 31344432027934429150200553978812

Offset: 1

Author

Paul D. Hanna, May 25 2018

Keywords

• nonn

Links

• Paul D. Hanna, Table of n, a(n) for n = 1..300

Crossrefs

Cf. A304400.

Programs

PARI

{a(n) = my(A=[1], m); for(i=1, n, A=concat(A, 0); m=#A; A[m] = Vec( exp( (m-1)^2 * x * Ser(A) ) * (2 - Ser(A)) )[m] ); A[n+1]/n^2}
for(n=1, 20, print1(a(n), ", "))