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 A224015 #6 Apr 21 2021 13:56:38 %S A224015 243,7776,62764,297859,1108969,3516324,9866389,25128396,59129041, %T A224015 130220738,271055417,537353315,1020817107,1867650094,3304497043, %U A224015 5674041696,9482969967,15465546464,24666658243,38548857659,59128689861 %N A224015 Number of 5 X n 0..2 arrays with rows nondecreasing and antidiagonals unimodal. %C A224015 Row 5 of A224012. %H A224015 R. H. Hardin, <a href="/A224015/b224015.txt">Table of n, a(n) for n = 1..210</a> %F A224015 Empirical: a(n) = (1009/907200)*n^10 + (913/36288)*n^9 + (20887/60480)*n^8 + (92987/30240)*n^7 + (835267/43200)*n^6 + (125341/1728)*n^5 + (33910279/181440)*n^4 + (8169817/45360)*n^3 + (2581069/25200)*n^2 + (35674/63)*n + 336 for n>3. %e A224015 Some solutions for n=3 %e A224015 ..1..2..2....1..1..1....0..1..2....2..2..2....0..2..2....2..2..2....0..1..2 %e A224015 ..1..1..1....0..0..0....1..1..2....0..0..1....1..2..2....0..2..2....2..2..2 %e A224015 ..1..1..2....0..0..0....0..1..1....0..1..1....0..1..1....1..1..1....0..2..2 %e A224015 ..0..0..1....1..1..1....0..1..2....0..1..2....0..0..2....0..1..1....0..0..1 %e A224015 ..0..1..2....0..0..1....2..2..2....2..2..2....0..1..2....0..2..2....0..1..1 %Y A224015 Cf. A224012. %K A224015 nonn %O A224015 1,1 %A A224015 _R. H. Hardin_ Mar 30 2013