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 A224161 #6 Jul 23 2025 05:01:29 %S A224161 32,324,900,1783,3469,6786,13283,25624,48339,88755,158358,274636, %T A224161 463580,763045,1227226,1932567,2985495,4532457,6772837,9975443, %U A224161 14499382,20820285,29563005,41542090,57811531,79725503,109012056,147861974 %N A224161 Number of 5Xn 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing. %C A224161 Row 5 of A224158 %H A224161 R. H. Hardin, <a href="/A224161/b224161.txt">Table of n, a(n) for n = 1..210</a> %F A224161 Empirical: a(n) = (1/3628800)*n^10 - (1/241920)*n^9 + (13/60480)*n^8 - (1/2688)*n^7 + (15793/172800)*n^6 - (10013/11520)*n^5 + (3158927/362880)*n^4 - (461413/12096)*n^3 + (13189843/50400)*n^2 - (797567/840)*n + 2301 for n>6 %e A224161 Some solutions for n=3 %e A224161 ..0..0..0....0..1..0....0..0..0....1..1..0....0..1..1....0..0..1....0..1..0 %e A224161 ..0..0..0....1..0..0....0..0..1....1..0..0....1..1..0....0..1..0....1..0..0 %e A224161 ..1..1..0....0..0..0....1..1..0....0..0..0....1..1..0....1..0..0....0..1..1 %e A224161 ..1..1..1....1..0..0....1..0..0....0..1..0....1..0..0....0..1..0....1..1..0 %e A224161 ..1..1..1....1..0..0....1..0..0....1..1..1....1..0..0....1..1..0....1..0..0 %K A224161 nonn %O A224161 1,1 %A A224161 _R. H. Hardin_ Mar 31 2013