A069580 Noninvertible n X n matrices mod 4 (i.e., over the ring Z_4).

2, 160, 176128, 2973761536, 790377061679104, 3337070496489549070336, 224673304169436873829314985984, 241628003280411784073600553618302304256, 4154447778684876644944282114016459737751307157504

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Formula

a(n) = 4^(n^2) - A065128(n).

Crossrefs

Cf. A011787, A065128.

Sequence in context: A179958 A272244 A178575 * A332218 A202107 A300363

Adjacent sequences: A069577 A069578 A069579 * A069581 A069582 A069583

Keyword

nonn

Author

Sharon Sela (sharonsela(AT)hotmail.com), Apr 18 2002

Extensions

More terms from Max Alekseyev, Jan 23 2012

Status

approved