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 A367826 #13 Dec 08 2023 11:38:59
%S A367826 1,0,0,0,0,0,0,0,0,0,0,-9,3,30,57,27,126,196,130,333,172,186,-28,319,
%T A367826 169,262,317,293,297,568,252,525,417,-114,455,309,308,612,566,543,409,
%U A367826 652,325,627,-64,268,552,685,426,702,534,517,485,646,399,-295,497,486,640,733,440
%N A367826 Antidiagonal sums of A367824.
%H A367826 Stefano Spezia, <a href="/A367826/b367826.txt">Table of n, a(n) for n = 0..10000</a>
%t A367826 A367824[0,0]=1; A367824[n_,k_]:=Numerator[(FromDigits[Reverse[IntegerDigits[n]]]-k)/(n+k)]; Table[Sum[A367824[n-k,k],{k,0,n}],{n,0,60}]
%Y A367826 Cf. A004086, A367824.
%K A367826 sign,base,look
%O A367826 0,12
%A A367826 _Stefano Spezia_, Dec 02 2023