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 A373658 #3 Jun 13 2024 01:40:32
%S A373658 1,3,13,88,749,8128,105453,1606368,28047561,552980736,12149820237,
%T A373658 294451219712,7803392603109,224513730740224,6969658947747357,
%U A373658 232210548740331008,8265038127738534417,312994090288528379904,12565925964816171109069,533124629548518534705152
%N A373658 a(n) = Sum_{k=0..n} binomial(n, k)*A050446(n, n - k). Alternating row sums of A373660.
%p A373658 a := n -> local k; add(binomial(n, k) * A050446(n, n - k), k = 0..n):
%p A373658 seq(a(n), n = 0..19);
%Y A373658 Cf. A050446, A373660.
%K A373658 nonn
%O A373658 0,2
%A A373658 _Peter Luschny_, Jun 13 2024