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 A223776 #6 Jul 23 2025 04:30:02 %S A223776 29,267,1269,4246,11635,28346,64256,138913,290180,589799,1170809, %T A223776 2274787,4331570,8091182,14838137,26733456,47351379,82508140, %U A223776 141522193,239102564,398139077,653770622,1059242178,1694236163,2676588670,4178587937 %N A223776 Number of nX7 0..1 arrays with rows and columns unimodal and antidiagonals nondecreasing. %C A223776 Column 7 of A223777 %H A223776 R. H. Hardin, <a href="/A223776/b223776.txt">Table of n, a(n) for n = 1..210</a> %F A223776 Empirical: a(n) = (1/87178291200)*n^14 + (1/4151347200)*n^13 + (1/106444800)*n^12 + (53/319334400)*n^11 + (409/87091200)*n^10 + (1681/29030400)*n^9 + (862999/609638400)*n^8 - (56411/29030400)*n^7 + (3673639/14515200)*n^6 - (4250857/7257600)*n^5 + (1960444733/119750400)*n^4 - (326164913/4989600)*n^3 + (89807927381/151351200)*n^2 - (113103797/51480)*n + 3030 for n>4 %e A223776 Some solutions for n=3 %e A223776 ..0..1..0..0..0..0..0....0..0..0..0..1..1..0....0..0..0..0..0..0..0 %e A223776 ..1..1..1..1..1..1..0....0..0..0..1..1..1..0....0..0..0..0..1..1..1 %e A223776 ..1..1..1..1..1..1..0....0..0..1..1..1..1..1....1..1..1..1..1..1..1 %K A223776 nonn %O A223776 1,1 %A A223776 _R. H. Hardin_ Mar 27 2013