A011787 Number of n X n matrices over Z_4 whose determinant is 1.

1, 48, 43008, 660602880, 167761422581760, 692647993190048071680, 46119672943810238272430407680, 49327181820263339694887026906732953600, 845779385319367513935228608424336170436211507200

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 * A345646 A370515 A292516

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