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 A357342 #4 Oct 01 2022 08:38:25
%S A357342 1,2,13,298,14825,1238896,154892713,27009853886,6257900733745,
%T A357342 1858486623941620,688135964728698641,310726469248576739458,
%U A357342 168049914540105868641241,107234597681651999462375720,79717829408115648827783288185,68293032241442657676784109954086
%N A357342 a(n) = Sum_{k=0..n} ((-1)^(n - k) * A357339(n, k)).
%Y A357342 Cf. A357339.
%K A357342 nonn
%O A357342 0,2
%A A357342 _Peter Luschny_, Sep 25 2022