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 A145358 #9 Jul 03 2023 10:06:04
%S A145358 1,7,49,421,3697,37933,404341,4841341,61291861,848268421,12465197269,
%T A145358 197121724549,3302727019621,58876330343173,1107627703783909,
%U A145358 21990846791015845,458649487144877029,10035575758396240549,229687317927141716005,5489966024995169233573
%N A145358 Row sums of triangle A145357 and of array A145356.
%F A145358 a(n) = Sum_{m=1..n} A145357(n,m).
%Y A145358 Cf. A145356, A145357.
%K A145358 nonn,easy
%O A145358 1,2
%A A145358 _Wolfdieter Lang_, Oct 17 2008
%E A145358 Changed offset from 0 to 1 by _Wolfdieter Lang_, Nov 17 2008