A069580 - OEIS

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A069580

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

2, 160, 176128, 2973761536, 790377061679104, 3337070496489549070336, 224673304169436873829314985984, 241628003280411784073600553618302304256, 4154447778684876644944282114016459737751307157504 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	FORMULA	`a(n) = 4^(n^2) - A065128(n)`
	CROSSREFS	`Cf. A065128, A011787` `Sequence in context: A170992 A179958 A178575 * A202107 A109420 A162904` `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 (maxale(AT)gmail.com), Jan 23 2012`

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Last modified February 16 11:51 EST 2012. Contains 205908 sequences.