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 A184758 #9 Sep 05 2025 19:40:14 %S A184758 32,1129,44391,1713803,66363023,2568513843,99419347147,3848174315295, %T A184758 148949599913987,5765325542821919,223155884726125003, %U A184758 8637595276083930107,334331547130486255947,12940822049109738429467,500894626143397858765227 %N A184758 Half the number of n X 6 binary arrays with no 1 having an adjacent 1 both above and to its left. %C A184758 Column 6 of A184761. %H A184758 R. H. Hardin, <a href="/A184758/b184758.txt">Table of n, a(n) for n = 1..200</a> %e A184758 Some solutions for 3 X 6 %e A184758 ..0..0..1..0..0..0....0..1..1..1..0..0....0..0..0..1..0..1....0..0..1..1..1..0 %e A184758 ..0..0..1..0..0..1....1..0..0..0..0..1....1..1..1..0..0..0....0..0..0..0..1..0 %e A184758 ..0..0..1..0..1..0....0..1..0..1..0..1....0..0..1..1..1..1....0..0..1..0..1..1 %Y A184758 Cf. A184761. %K A184758 nonn,changed %O A184758 1,1 %A A184758 _R. H. Hardin_, Jan 21 2011