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A075691 Let M(k) be the kxk matrix m_(i,j) = i (modj) - j (modi); then a(n)=det(M(2*n)). 0
1, 1, 81, 81, 53361, 57744801, 119836809, 3231369355201, 3030985307728225, 1788629609520903241, 6271587203171610961, 566023524795406585035241, 135075661787247287434787209, 202466242679530681259970248569 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Terms are squares. det(M(2*n+1))=0.

LINKS

Table of n, a(n) for n=1..14.

PROG

(PARI) a(n)=matdet(matrix(2*n, 2*n, i, j, i%j-j%i))

CROSSREFS

Sequence in context: A206143 A087410 A177842 * A055390 A186472 A183984

Adjacent sequences:  A075688 A075689 A075690 * A075692 A075693 A075694

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Oct 12 2002

STATUS

approved

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Last modified May 19 04:41 EDT 2013. Contains 225428 sequences.