A069580 - OEIS

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A069580

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

1

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

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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