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 A224407 #7 Aug 30 2018 06:10:31 %S A224407 22,169,879,3902,16420,68282,284254,1187830,4979464,20913026,87905004, %T A224407 369597368,1554028138,6533901986,27470619810,115492192540, %U A224407 485546657850,2041301158120,8581884687952,36079321433650,151682073514422 %N A224407 Number of n X 6 0..1 arrays with rows unimodal and antidiagonals nondecreasing. %C A224407 Column 6 of A224409. %H A224407 R. H. Hardin, <a href="/A224407/b224407.txt">Table of n, a(n) for n = 1..210</a> %F A224407 Empirical: a(n) = 7*a(n-1) -14*a(n-2) +9*a(n-3) +4*a(n-5) +16*a(n-6) for n>7. %F A224407 Empirical g.f.: x*(22 + 15*x + 4*x^2 - 83*x^3 - 109*x^4 - 29*x^5 + 14*x^6) / (1 - 7*x + 14*x^2 - 9*x^3 - 4*x^5 - 16*x^6). - _Colin Barker_, Aug 30 2018 %e A224407 Some solutions for n=3: %e A224407 ..0..0..0..0..0..0....0..0..0..0..0..1....1..0..0..0..0..0....0..0..0..1..0..0 %e A224407 ..0..0..0..0..1..0....0..0..0..1..1..1....0..1..1..1..0..0....0..0..1..1..0..0 %e A224407 ..0..0..1..1..1..0....0..1..1..1..1..0....1..1..1..0..0..0....1..1..1..0..0..0 %Y A224407 Cf. A224409. %K A224407 nonn %O A224407 1,1 %A A224407 _R. H. Hardin_, Apr 05 2013