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A213700
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Half the number of 5X5 0..n symmetric arrays with no 2X2 subblock summing to 2n
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1
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529, 750261, 109820000, 4286833981, 83545858925, 976919547736, 8159542628448, 51964311225934, 271341777491743, 1197645088919101, 4637119560078960, 16013821321719463, 50395763900241707, 145985579644461562
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..3..2..3..4....3..0..0..1..4....0..4..0..2..3....0..1..2..2..4
..3..4..3..1..3....0..2..3..1..1....4..2..0..3..3....1..2..4..1..0
..2..3..4..2..4....0..3..2..4..3....0..0..4..3..1....2..4..2..3..1
..3..1..2..4..1....1..1..4..1..4....2..3..3..2..0....2..1..3..1..4
..4..3..4..1..1....4..1..3..4..3....3..3..1..0..4....4..0..1..4..4
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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