|
| |
|
|
A069920
|
|
Noninvertible n X n matrices mod 6 (i.e. over the ring Z_6).
|
|
0
| |
|
|
4, 1008, 8190720, 2332005728256, 23674927650073214976, 8618480376852061696039059456, 112746432609478969278312620164116381696, 53053593891934168169788522401776516627950360068096
(list; graph; refs; listen; history; internal format)
|
|
|
|
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
| Cf. A065498, A069580.
Sequence in context: A180268 A087365 A024059 * A013780 A139300 A004804
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 (benoit7848c(AT)orange.fr), May 11 2002
|
| |
|
|
