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A011787 Number of n X n matrices over Z_4 whose determinant is 1. 4
1, 48, 43008, 660602880, 167761422581760, 692647993190048071680, 46119672943810238272430407680, 49327181820263339694887026906732953600, 845779385319367513935228608424336170436211507200 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

FORMULA

a(n) = A065128(n)/2

CROSSREFS

Sequence in context: A159665 A164278 A159441 * A292516 A006070 A081262

Adjacent sequences:  A011784 A011785 A011786 * A011788 A011789 A011790

KEYWORD

nonn

AUTHOR

benlove(AT)preston.polaristel.net (Benjamin T. Love)

EXTENSIONS

More terms from Max Alekseyev, Jan 22 2012

STATUS

approved

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Last modified November 17 03:06 EST 2019. Contains 329216 sequences. (Running on oeis4.)