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A204444
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Permanent of the n-th principal submatrix of A204443.
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3
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1, 1, 2, 9, 34, 140, 672, 4752, 32304, 230832, 1780704, 17927568, 175473216, 1780206336, 18988867584, 248341303296, 3173837230080, 41713375334400, 568818754560000, 9150176586240000, 144343174487040000, 2329812142295040000
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OFFSET
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1,3
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LINKS
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MATHEMATICA
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f[i_, j_] := Floor[(i + j + 3)/4] - Floor[(i + j)/4];
m[n_] := Table[f[i, j], {i, 1, n}, {j, 1, n}]
TableForm[m[8]] (* 8x8 principal submatrix *)
Flatten[Table[f[i, n + 1 - i],
{n, 1, 14}, {i, 1, n}]] (* A204443 *)
Permanent[m_] :=
With[{a = Array[x, Length[m]]},
Coefficient[Times @@ (m.a), Times @@ a]];
Table[Permanent[m[n]], {n, 1, 22}] (* A204444 *)
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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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