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A225994
Number of pairs of orthogonal (-2,5) vectors of length 7*n.
1
378, 5133128, 81705087744, 983771662124160, 13027612739061516288, 180842352214339004973056, 2505372582582745606695616512, 35065654463193295271305370959872, 495605164965018396615832445084368896
OFFSET
1,1
COMMENTS
Row 8 of A225987.
LINKS
EXAMPLE
Some solutions for n=1
.-2..5...-2..5...-2..5...-2..5....5..5...-2..5....5..5....5..5...-2..5...-2..5
.-2..5....5..5....5.-2...-2..5....5..5....5..5...-2..5...-2..5....5..5....5.-2
..5..5...-2..5....5.-2....5.-2...-2..5....5.-2....5.-2....5.-2....5.-2....5..5
.-2..5...-2..5....5.-2....5.-2...-2..5....5..5...-2..5....5..5....5.-2....5..5
..5.-2....5.-2....5.-2....5..5....5.-2....5.-2...-2..5...-2..5....5.-2...-2..5
..5..5....5..5....5..5....5.-2...-2..5....5.-2....5.-2....5.-2....5.-2...-2..5
..5.-2....5.-2....5..5....5..5...-2..5...-2..5....5..5....5.-2....5..5...-2..5
CROSSREFS
Sequence in context: A289347 A171115 A328552 * A228554 A108385 A341188
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 22 2013
STATUS
approved