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A071535 (-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]. 0
1, 15, 176, 1680, 13824, 102144, 696320, 4460544, 27197440, 159318016, 902823936, 49754, 93120, 26776436736, 141180272640, 731218182144, 3728300048384, 18747532247040, 931, 10596009984, 457328117678080 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..21.

PROG

(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)))), ", "))

CROSSREFS

Sequence in context: A120995 A024197 A210782 * A081043 A155000 A009146

Adjacent sequences:  A071532 A071533 A071534 * A071536 A071537 A071538

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Jun 20 2002

STATUS

approved

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Last modified October 1 00:19 EDT 2014. Contains 247497 sequences.