%I #7 Jul 30 2017 22:09:24
%S 4,1008,8190720,2332005728256,23674927650073214976,
%T 8618480376852061696039059456,112746432609478969278312620164116381696,
%U 53053593891934168169788522401776516627950360068096
%N Noninvertible n X n matrices mod 6 (i.e., over the ring Z_6).
%F a(n) = 6^(n^2) - A065498(n).
%o (PARI) for(n=1,10,print1(6^(n^2)*(1-prod(k=1,n,(1-1/2^k)*(1-1/3^k))),","))
%Y Cf. A065498, A069580.
%K nonn
%O 1,1
%A Sharon Sela (sharonsela(AT)hotmail.com), May 05 2002
%E More terms from _Benoit Cloitre_, May 11 2002