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A278926
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a(n) = permanent M_n where M_n is the n X n matrix m(i,j) = i^4 + j^4.
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4
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1, 2, 353, 561608, 4341274884, 111107400842568, 7493918659070379300, 1139021252689549522419840, 348457223545199873458486125120, 196982631587037086047232203674775680, 192443334239172066295878807351087122210880, 307899710379447999264505625949360598523097530880
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) ~ c * d^n * n!^5 / n^2, where d = 11.83108... and c = 0.68284...
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MAPLE
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with(LinearAlgebra):
a:= n-> `if`(n=0, 1, Permanent(Matrix(n, (i, j)-> i^4+j^4))):
seq(a(n), n=0..16);
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MATHEMATICA
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Flatten[{1, Table[Permanent[Table[i^4+j^4, {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, i^4+j^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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