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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.

A224018 Number of n X n 0..3 arrays with rows nondecreasing and antidiagonals unimodal.

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%I A224018 #7 Jul 23 2025 04:52:15
%S A224018 4,100,6796,772683,120352359,23151623729,5173325036371,
%T A224018 1291969529189675,351545826740833046,102423287609988684833,
%U A224018 31560026488902316691503,10191808855482615567911934,3425597818181959478072701084
%N A224018 Number of n X n 0..3 arrays with rows nondecreasing and antidiagonals unimodal.
%C A224018 Diagonal of A224024
%e A224018 Some solutions for n=3
%e A224018 ..0..0..1....0..1..1....2..3..3....1..1..1....0..3..3....2..2..3....2..3..3
%e A224018 ..1..2..3....1..2..3....3..3..3....0..0..2....1..3..3....1..2..3....1..1..3
%e A224018 ..0..2..3....0..0..2....1..1..3....0..2..2....0..1..1....0..2..2....0..1..3
%K A224018 nonn
%O A224018 1,1
%A A224018 _R. H. Hardin_ Mar 30 2013

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