This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A367157 #9 Nov 10 2023 04:00:22 %S A367157 1,1,7,107,2528,81324,3317958,164182458,9555617008,639681044040, %T A367157 48424744784136,4090543382765520,381452559291894864, %U A367157 38923292146836546864,4313976527840736485280,516083186352589573976208,66281598254535375499398144,9096262997259437367544137984 %N A367157 E.g.f. satisfies A(x) = 1 + A(x)^3 * log(1 + x*A(x)). %F A367157 a(n) = Sum_{k=0..n} (n+3*k)!/(n+2*k+1)! * Stirling1(n,k). %t A367157 Table[Sum[(n+3*k)!/(n+2*k+1)! * StirlingS1[n,k], {k,0,n}], {n,0,20}] (* _Vaclav Kotesovec_, Nov 10 2023 *) %o A367157 (PARI) a(n) = sum(k=0, n, (n+3*k)!/(n+2*k+1)!*stirling(n, k, 1)); %Y A367157 Cf. A367156. %K A367157 nonn %O A367157 0,3 %A A367157 _Seiichi Manyama_, Nov 07 2023