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 A186023 #16 Nov 10 2022 07:39:07 %S A186023 1,1,1,2,1,1,6,4,1,1,23,15,6,1,1,106,68,28,8,1,1,567,365,145,45,10,1, %T A186023 1,3434,2215,877,262,66,12,1,1,23137,14917,5936,1750,427,91,14,1,1, %U A186023 171174,110324,43936,13020,3108,648,120,16,1,1,1376525,887232,353067,104904,25125,5091,933,153,18,1,1 %N A186023 Eigentriangle of triangle A085478. %C A186023 First column is A125273. Inverse of A186024. Rows sums are A125273(n)*(2-0^n). %H A186023 Paul Barry, <a href="http://arxiv.org/abs/1107.5490">Invariant number triangles, eigentriangles and Somos-4 sequences</a>, arXiv preprint arXiv:1107.5490 [math.CO], 2011. %e A186023 Triangle begins %e A186023 1; %e A186023 1, 1; %e A186023 2, 1, 1; %e A186023 6, 4, 1, 1; %e A186023 23, 15, 6, 1, 1; %e A186023 106, 68, 28, 8, 1, 1; %e A186023 567, 365, 145, 45, 10, 1, 1; %e A186023 3434, 2215, 877, 262, 66, 12, 1, 1; %e A186023 23137, 14917, 5936, 1750, 427, 91, 14, 1, 1; %e A186023 171174, 110324, 43936, 13020, 3108, 648, 120, 16, 1, 1; %Y A186023 Cf. A125273, A186020, A186024, %K A186023 nonn,tabl %O A186023 0,4 %A A186023 _Paul Barry_, Feb 10 2011