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 A188846 #7 Jul 22 2025 11:24:49 %S A188846 12,144,908,5711,32204,181557,1001368,5521489,30306759,166323490, %T A188846 911899467,4999341631,27402344925,150194353126,823189068247, %U A188846 4511728088822,24727593668449,135525199872089,742775009335794 %N A188846 Number of nX4 binary arrays without the pattern 0 0 1 vertically, antidiagonally or horizontally. %C A188846 Column 4 of A188851 %H A188846 R. H. Hardin, <a href="/A188846/b188846.txt">Table of n, a(n) for n = 1..200</a> %F A188846 Empirical: a(n) = 2*a(n-1) +28*a(n-2) -6*a(n-3) -237*a(n-4) -150*a(n-5) +757*a(n-6) +891*a(n-7) -942*a(n-8) -1844*a(n-9) +173*a(n-10) +1695*a(n-11) +562*a(n-12) -619*a(n-13) -422*a(n-14) +78*a(n-16) +31*a(n-17) +4*a(n-18) %e A188846 Some solutions for 3X4 %e A188846 ..0..1..0..1....1..0..1..1....1..1..1..1....0..1..0..1....1..0..0..0 %e A188846 ..1..0..1..1....1..1..1..1....1..1..0..0....0..1..1..0....0..1..1..1 %e A188846 ..0..1..0..0....1..0..1..1....1..1..0..0....0..0..0..0....0..1..1..0 %K A188846 nonn %O A188846 1,1 %A A188846 _R. H. Hardin_ Apr 12 2011