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Number of n X n 0..3 arrays with the row and column sums nondecreasing

0

`%I #6 Dec 18 2015 18:17:56
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`%S 4,90,15688,27871870,550113111784
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`%N Number of n X n 0..3 arrays with the row and column sums nondecreasing
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`%C Diagonal of A202581
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`%e Some solutions for n=3
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`%e ..0..1..0....1..0..1....0..1..2....0..1..2....0..1..1....0..2..1....1..1..0
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`%e ..1..0..3....0..1..3....0..3..0....0..2..2....2..0..2....1..1..2....2..0..1
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`%e ..2..3..1....3..3..0....1..0..2....2..0..3....1..2..3....0..3..3....0..2..3
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`%K nonn
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`%O 1,1
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`%A _R. H. Hardin_ Dec 21 2011
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