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A332729
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Number of nonnegative integer n X n matrices with row and column sums 2 and sum of entries below the main diagonal n - 1.
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2
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1, 1, 11, 114, 2438, 73120, 3107640, 175157568, 12683256458, 1146644890542, 126603925984322, 16764298017398342, 2622239904802101734, 478350006311298468126, 100655530463934465864626, 24200010145455307873369888, 6592700960401481917596215614, 2020180735699844322843722782402
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OFFSET
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1,3
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LINKS
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EXAMPLE
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The a(2) = 1 matrix is:
[1 1]
[1 1]
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MATHEMATICA
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A269742 = Cases[Import["https://oeis.org/A269742/b269742.txt", "Table"], {_, _}][[All, 2]];
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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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