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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A225999 Number of pairs of orthogonal (-1,7) vectors of length 8*n.

Original entry on oeis.org

520, 14162160, 778340380576, 18604134178857920, 459346524767252653440, 14452627739116790817780480, 429730376813858492544466736640, 12361758128173322901773061686443008
Offset: 1

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Author

R. H. Hardin, May 22 2013

Keywords

Comments

Row 13 of A225987.

Examples

			Some solutions for n=1
.-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7...-1..7
..7..7...-1..7....7..7...-1..7...-1..7....7.-1....7.-1....7..7....7..7....7.-1
..7.-1...-1..7...-1..7....7.-1....7.-1....7.-1...-1..7...-1..7...-1..7...-1..7
..7.-1....7.-1...-1..7....7..7....7.-1...-1..7....7..7....7.-1....7.-1....7..7
..7.-1....7.-1...-1..7....7.-1...-1..7....7.-1....7.-1....7.-1....7.-1....7.-1
.-1..7....7..7....7.-1....7.-1...-1..7...-1..7...-1..7...-1..7....7.-1...-1..7
..7.-1....7.-1....7.-1...-1..7...-1..7....7.-1....7.-1...-1..7...-1..7...-1..7
..7.-1....7.-1...-1..7....7.-1....7..7....7..7....7.-1...-1..7...-1..7....7.-1

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