A085404 Number of n X n matrices over GF(4) with rank n-1.

1, 75, 79380, 1310904000, 344319762124800, 1444887697908695040000, 96976611786040182520676352000, 104131021972308383324202529613414400000, 1788970984376098024967914354100894418012733440000

Offset

1,2

Links

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

Formula

For n>=2: a(n) = product j=0...n-2 (4^n - 4^j)^2 / (4^(n-1)- 4^j).

Crossrefs

Cf. A086752, A053291, A060869.

Sequence in context: A259464 A116527 A263064 * A110100 A003745 A301468

Adjacent sequences: A085401 A085402 A085403 * A085405 A085406 A085407

Keyword

nonn,easy

Author

Yuval Dekel (dekelyuval(AT)hotmail.com), Jul 31 2003

Extensions

More terms from David Wasserman, Jan 31 2005

Status

approved