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 A302274 #7 Apr 05 2018 04:09:47 %S A302274 2,10,29,89,353,941,3316,12016,34060,120940,415304,1257949,4395268, %T A302274 14710881,46444038,159674287,528683443,1709740974,5804427370, %U A302274 19154720511,62771586925,211230338251,697032878924,2300170434527,7695594400341 %N A302274 Number of n X 4 0..1 arrays with every element equal to 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A302274 Column 4 of A302278. %H A302274 R. H. Hardin, <a href="/A302274/b302274.txt">Table of n, a(n) for n = 1..210</a> %H A302274 R. H. Hardin, <a href="/A302274/a302274.txt">Empirical recurrence of order 72</a> %F A302274 Empirical recurrence of order 72 (see link above) %e A302274 Some solutions for n=5: %e A302274 0 0 1 1 0 1 0 1 0 0 1 0 0 0 1 0 0 1 1 1 %e A302274 1 0 0 1 1 0 1 0 1 1 0 1 1 1 0 0 0 0 1 0 %e A302274 0 1 0 1 1 0 1 0 1 0 1 0 0 1 0 0 0 0 0 0 %e A302274 0 0 1 1 0 1 0 1 1 1 1 1 0 0 1 0 1 1 0 1 %e A302274 0 0 1 1 0 0 0 0 0 0 0 0 0 0 1 1 0 0 1 0 %Y A302274 Cf. A302278. %K A302274 nonn %O A302274 1,1 %A A302274 _R. H. Hardin_, Apr 04 2018