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 A375867 #7 Sep 01 2024 09:35:59
%S A375867 1,2,10,82,950,14324,266994,5940218,153797742,4545958914,151125136298,
%T A375867 5583189029004,226989660492422,10073099346726602,484570780412539874,
%U A375867 25120235800280494530,1396186059626363259038,82828021612821756140124
%N A375867 E.g.f. satisfies A(x) = exp( 2 * (exp(x*A(x)^(1/2)) - 1) ).
%F A375867 a(n) = 2 * Sum_{k=0..n} (n+2)^(k-1) * Stirling2(n,k).
%o A375867 (PARI) a(n) = 2*sum(k=0, n, (n+2)^(k-1)*stirling(n, k, 2));
%Y A375867 Cf. A001861, A030019, A065866.
%K A375867 nonn
%O A375867 0,2
%A A375867 _Seiichi Manyama_, Sep 01 2024