A225996 Number of pairs of orthogonal (-4,5) vectors of length 9*n.

3024, 1596291840, 294038117867520, 68184361565718773760, 16084808323123050319970304, 3830251318099321155852479496192, 931823480133178593246564251905032192

Offset: 1

Author

R. H. Hardin, May 22 2013

Keywords

• nonn

Comments

Row 10 of A225987.

Examples

			Some solutions for n=1
..5..5....5..5...-4..5...-4..5...-4..5...-4..5...-4.-4...-4..5...-4..5...-4..5
.-4..5....5..5...-4..5...-4.-4....5..5...-4..5...-4..5...-4.-4...-4.-4....5..5
.-4..5...-4..5....5..5....5.-4....5.-4....5..5...-4..5...-4.-4...-4.-4...-4..5
..5..5....5.-4....5..5...-4.-4....5..5...-4..5...-4.-4....5.-4...-4..5...-4..5
..5.-4....5..5....5.-4...-4..5....5..5...-4..5...-4.-4....5.-4....5.-4...-4..5
.-4..5...-4..5....5..5...-4..5....5.-4....5..5...-4..5...-4.-4...-4.-4....5..5
..5..5...-4..5....5..5...-4.-4....5.-4....5..5...-4.-4...-4.-4...-4.-4....5..5
.-4..5...-4..5....5.-4...-4.-4....5..5....5..5...-4.-4...-4.-4...-4.-4....5.-4
..5..5....5..5....5.-4...-4.-4...-4..5...-4..5....5.-4...-4..5....5.-4....5..5
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..56