A060721 Singular n X n matrices over GF(7).

1, 385, 6569479, 5421836400001, 218857429741036363207, 432771509734663800164593788001, 41931064368881878511703371604583698172807

Offset

1,2

Links

Harry J. Smith, Table of n, a(n) for n = 1..34

Formula

For n >= 1, a(n) = 7^(n^2) - A053293(n) = 7^(n^2) - (7^n - 1)*(7^n - 7)*...*(7^n - 7^(n-1)).

Maple

for n from 1 to 15 do printf(`%d, `, 7^(n^2) - product(7^n-7^j, j=0..n-1)) od:

Prog

(PARI) a(n)={7^(n^2) - prod(j=0, n - 1, 7^n - 7^j)} \\ Harry J. Smith, Jul 10 2009

Crossrefs

Cf. A053293.

Sequence in context: A264421 A063390 A130612 * A116316 A213115 A277988

Adjacent sequences: A060718 A060719 A060720 * A060722 A060723 A060724

Keyword

nonn

Author

Avi Peretz (njk(AT)netvision.net.il), Apr 21 2001

Extensions

More terms from James A. Sellers, Apr 24 2001

Status

approved