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A278858
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a(n) = permanent M_n where M_n is the n X n matrix m(i,j) = abs(i^2-j^2).
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2
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1, 0, 9, 240, 36864, 7741440, 3363235524, 2203143038208, 2248347011420160, 3260265586467690240, 6578570637254005920000, 17755898734939822501524480, 62673017366111480630785474560, 282641923592380319367599892725760, 1599753679036773033206787507696238848
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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Flatten[{1, Table[Permanent[Table[Abs[i^2-j^2], {i, 1, n}, {j, 1, n}]], {n, 1, 15}]}]
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PROG
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(PARI) {a(n) = matpermanent(matrix(n, n, i, j, abs(i^2-j^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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