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 A303458 #4 Apr 24 2018 10:23:57 %S A303458 8,128,1696,22756,306448,4129588,55681352,750838628,10125474040, %T A303458 136549176292,1841478572144,24833903347572,334906650542448, %U A303458 4516506726074020,60909019475694136,821411104147953668 %N A303458 Number of 4Xn 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. %C A303458 Row 4 of A303456. %H A303458 R. H. Hardin, <a href="/A303458/b303458.txt">Table of n, a(n) for n = 1..210</a> %F A303458 Empirical: a(n) = 14*a(n-1) +18*a(n-2) -338*a(n-3) -62*a(n-4) +1192*a(n-5) -648*a(n-6) +1818*a(n-7) +1407*a(n-8) -3144*a(n-9) +3656*a(n-10) -8832*a(n-11) -7324*a(n-12) +8010*a(n-13) +2202*a(n-14) +3312*a(n-15) for n>16 %e A303458 Some solutions for n=5 %e A303458 ..0..0..1..0..0. .0..0..0..0..0. .0..1..0..1..1. .0..1..0..0..1 %e A303458 ..0..1..1..1..1. .0..1..0..1..0. .0..0..1..1..1. .0..1..0..0..0 %e A303458 ..0..1..1..0..0. .0..1..1..0..1. .1..0..0..0..0. .0..0..0..1..1 %e A303458 ..0..0..1..1..1. .0..0..1..1..0. .0..0..1..1..0. .1..0..1..1..1 %Y A303458 Cf. A303456. %K A303458 nonn %O A303458 1,1 %A A303458 _R. H. Hardin_, Apr 24 2018