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

Author

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

Keywords

• nonn
• easy

Crossrefs

Cf. A086752, A053291, A060869.

Formula

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

Extensions

More terms from David Wasserman, Jan 31 2005