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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
OFFSET
1,1
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
Sequence in context: A180268 A087365 A024059 * A368371 A217024 A013780
KEYWORD
nonn
AUTHOR
Sharon Sela (sharonsela(AT)hotmail.com), May 05 2002
EXTENSIONS
More terms from Benoit Cloitre, May 11 2002
STATUS
approved