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 A285067 #11 Jun 22 2022 02:55:33
%S A285067 1,5,57,989,22833,658805,22810857,921455309,42540129633,2209407621605,
%T A285067 127500056700057,8093522778736829,560471288461196433,
%U A285067 42046635718027122005,3396986478841654717257,294048932819502579461549,27150267978072875530135233,2663529874012507049631576005
%N A285067 Row sums of triangle A285066.
%C A285067 See A285066 for details.
%F A285067 a(n) = Sum_{m=0..n} A285066(n, m), n >= 0.
%F A285067 E.g.f.: exp(x)/(2 - exp(4*x)).
%F A285067 a(n) ~ n! * 2^(2*n - 3/4) / log(2)^(n+1). - _Vaclav Kotesovec_, Apr 19 2017
%F A285067 a(n) = 1 + Sum_{k=1..n} binomial(n,k) * 4^k * a(n-k). - _Ilya Gutkovskiy_, Jun 21 2022
%Y A285067 Cf. A285066, A141413(n+2) (alternating row sums).
%K A285067 nonn,easy
%O A285067 0,2
%A A285067 _Wolfdieter Lang_, Apr 19 2017