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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.

A224275 Number of n X n 0..3 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.

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%I A224275 #7 Jul 23 2025 05:03:44
%S A224275 4,160,13683,1334973,137489538,14587480744,1597855917875,
%T A224275 182011677068828,21714188491890254,2721720866571310952,
%U A224275 357937736330145145387
%N A224275 Number of n X n 0..3 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.
%C A224275 Diagonal of A224281
%e A224275 Some solutions for n=3
%e A224275 ..2..0..0....0..1..1....0..0..1....0..0..0....0..0..1....2..1..1....0..0..0
%e A224275 ..2..2..1....2..2..2....3..2..2....0..1..1....3..3..1....3..2..1....0..0..1
%e A224275 ..3..3..3....2..3..0....2..2..2....2..2..1....3..3..2....2..2..3....1..2..1
%K A224275 nonn
%O A224275 1,1
%A A224275 _R. H. Hardin_ Apr 02 2013

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