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A019447
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Number of monomials in expansion of determinant of an n X n Toeplitz matrix [ t(|i-j|) ] in terms of its entries.
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1
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1, 2, 4, 12, 35, 120, 427, 1628, 6090, 23797, 90296, 350726, 1338076
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MAPLE
| f:=n->nops([coeffs(Determinant(Matrix(n, (i, j) -> a[abs(i-j)])))]): [seq(f(n), n=1..12)];
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MATHEMATICA
| f[n_] := Length[ Expand[ Det[ Table[ t[ Abs[ i - j]], {i, 1, n}, {j, 1, n}]]]]; Table[ f[n], {n, 1, 11}]
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CROSSREFS
| Sequence in context: A148204 A151525 A148205 * A148206 A148207 A112083
Adjacent sequences: A019444 A019445 A019446 * A019448 A019449 A019450
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KEYWORD
| nonn,more,hard,changed
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AUTHOR
| Herbert Wilf (wilf(AT)central.cis.upenn.edu)
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EXTENSIONS
| Terms a(12) and a(13) from Thotsaporn Thanatipanonda, Jan 26-28 2012.
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