A086065 Permanent of the n X n matrix whose element (i,j) equals sigma(|i-j|) where sigma(n) is the sum of divisors of n and sigma(0) = 0.

0, 1, 6, 196, 5408, 251132, 16873158, 1420208149, 154380762016, 20646224057048, 3433326930682392, 642182473998511032, 152740983098362758624, 40168709084329725908872, 12234598116934739577149272, 4256358836370109564151981956, 1716720258038432195907181692368

Offset

1,3

Links

Table of n, a(n) for n=1..17.

Prog

(PARI) a(n) = {my(M=matrix(n, n, i, j, if(i==j, 0, sigma(abs(i-j))))); matpermanent(M)} \\ Herman Jamke (hermanjamke(AT)fastmail.fm), May 14 2007

Crossrefs

Cf. A085511.

Sequence in context: A283884 A280552 A241137 * A200824 A351888 A340557

Adjacent sequences: A086062 A086063 A086064 * A086066 A086067 A086068

Keyword

nonn,changed

Author

Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 24 2003

Extensions

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 14 2007

Status

approved