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A071535
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(-1)^(n+1) * Determinant of n X n matrix of form [1^2 2^2 3^2 4^2 5^2 / 2^2 1^2 2^2 3^2 4^2 / 3^2 2^2 1^2 2^2 3^2 / 4^2 3^2 2^2 1^2 2^2 / 5^2 4^2 3^2 2^2 1^2].
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0
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1, 15, 176, 1680, 13824, 102144, 696320, 4460544, 27197440, 159318016, 902823936, 49754, 93120, 26776436736, 141180272640, 731218182144, 3728300048384, 18747532247040, 931, 10596009984, 457328117678080
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..21.
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PROG
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(PARI) for(n=1, 30, print1((-1)^(n+1)*matdet(matrix(n, n, i, j, sum(k=0, n-1, if(abs(i-j)-k, 0, (k+1)^2)))), ", "))
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CROSSREFS
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Sequence in context: A120995 A024197 A210782 * A081043 A155000 A009146
Adjacent sequences: A071532 A071533 A071534 * A071536 A071537 A071538
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre, Jun 20 2002
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STATUS
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approved
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