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 A223798 #6 Jun 14 2025 19:42:49 %S A223798 296,87616,16979881,2844578252,453578376041,70950413903439, %T A223798 11005258705825234,1701108873516414461,262573419115915016653, %U A223798 40505547476599298757032,6247008370524009857378298 %N A223798 Number of n X 5 0..3 arrays with rows and antidiagonals unimodal. %C A223798 Column 5 of A223801. %H A223798 R. H. Hardin, <a href="/A223798/b223798.txt">Table of n, a(n) for n = 1..210</a> %e A223798 Some solutions for n=3 %e A223798 ..0..0..3..3..1....0..0..3..1..0....0..0..1..3..1....0..0..2..2..0 %e A223798 ..0..0..2..3..3....0..0..2..2..1....0..0..0..3..1....0..0..0..1..1 %e A223798 ..0..1..3..3..2....0..0..0..1..0....0..0..0..0..1....0..0..1..2..1 %Y A223798 Cf. A223801. %K A223798 nonn %O A223798 1,1 %A A223798 _R. H. Hardin_, Mar 27 2013