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 A224156 #6 Jul 23 2025 05:01:10 %S A224156 22,169,702,2271,6786,20065,60214,184233,575410,1833641,5947567, %T A224156 19579806,65205152,219009930,740080588,2511332286,8545644419, %U A224156 29133026750,99436525669,339656225391,1160767044395,3968114261421,13567722769117 %N A224156 Number of nX6 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing. %C A224156 Column 6 of A224158 %H A224156 R. H. Hardin, <a href="/A224156/b224156.txt">Table of n, a(n) for n = 1..210</a> %F A224156 Empirical: a(n) = 7*a(n-1) -14*a(n-2) +3*a(n-3) +7*a(n-4) +24*a(n-5) -58*a(n-6) +62*a(n-7) -67*a(n-8) +112*a(n-9) -164*a(n-10) +193*a(n-11) -92*a(n-12) -46*a(n-13) +22*a(n-14) -60*a(n-15) -144*a(n-16) +42*a(n-17) -254*a(n-18) -28*a(n-19) -120*a(n-20) -72*a(n-21) +36*a(n-22) -4*a(n-23) +12*a(n-24) for n>27 %e A224156 Some solutions for n=3 %e A224156 ..0..0..0..1..1..0....0..0..0..0..0..0....1..0..0..0..0..0....0..0..0..1..0..0 %e A224156 ..0..0..1..1..1..0....0..0..1..1..1..1....0..0..0..0..0..0....1..1..1..1..0..0 %e A224156 ..0..1..1..1..0..0....1..1..1..1..1..1....0..0..0..0..1..0....1..1..1..0..0..0 %K A224156 nonn %O A224156 1,1 %A A224156 _R. H. Hardin_ Mar 31 2013