A069920 - OEIS

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A069920

Noninvertible n X n matrices mod 6 (i.e., over the ring Z_6).

0

4, 1008, 8190720, 2332005728256, 23674927650073214976, 8618480376852061696039059456, 112746432609478969278312620164116381696, 53053593891934168169788522401776516627950360068096

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

FORMULA

a(n) = 6^(n^2) - A065498(n).

PROG

(PARI) for(n=1, 10, print1(6^(n^2)*(1-prod(k=1, n, (1-1/2^k)*(1-1/3^k))), ", "))

CROSSREFS

Cf. A065498, A069580.

Sequence in context: A180268 A087365 A024059 * A368371 A217024 A013780

Adjacent sequences: A069917 A069918 A069919 * A069921 A069922 A069923

KEYWORD

nonn

AUTHOR

Sharon Sela (sharonsela(AT)hotmail.com), May 05 2002

EXTENSIONS

More terms from Benoit Cloitre, May 11 2002

STATUS

approved