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A056886
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Determinant of the n X n Hankel matrix whose entries are s_2 (i+j), 0 <= i, j < n, where s_2 is the sum of the base-2 bits.
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1
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1, 0, -1, 2, 5, -8, 3, 8, 141, -204, 11, -4, -11, -30, 99, 1836, 164997, -224532, 2403, -126, -39, 14, -5, -14, -267, -738, 351, -1134, -28431, -538002, 9537507, 891167508, 361226647845
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| Hankel transform of A000120.
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EXAMPLE
| a(2) = -1 because det [[0,1],[1,1]] = -1
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PROG
| (PARI) {a(n) = if( n<0, 0, matdet( matrix( n, n, i, j, 2*i + 2*j - 4 - valuation( (2*i + 2*j - 4)!, 2))))} /* Michael Somos Feb 08 2011 */
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CROSSREFS
| Sequence in context: A131598 A198545 A200225 * A197839 A021391 A162611
Adjacent sequences: A056883 A056884 A056885 * A056887 A056888 A056889
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KEYWORD
| sign
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AUTHOR
| Jeffrey Shallit (shallit(AT)graceland.uwaterloo.ca), Sep 04 2000
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EXTENSIONS
| Added a(0)=1 Michael Somos Feb 08 2011
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