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A199831 Number of -7..7 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero 1
140, 1820, 21364, 273728, 3579520, 47040968, 622300326, 8281149188, 110718596524, 1486040082748, 20010711643976, 270217094416868, 3657780168834780, 49618552941019396, 674346504318284036 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A199832
LINKS
EXAMPLE
Some solutions for n=3
.-7...-1....5....0...-6....0....2...-3...-4....5...-7....4...-5...-6....0...-3
.-1....2...-7...-2...-5...-4....1...-7....3....0....6...-6....4....1....1...-3
.-4...-3...-6....6....3....6....3....0...-1...-7....2...-5....0...-3...-2....5
..7...-3....2....0....7...-5....1....3....5....5....0....3...-2....2....3....7
..5....5....6...-4....1....3...-7....7...-3...-3...-1....4....3....6...-2...-6
CROSSREFS
Sequence in context: A133711 A184377 A255775 * A264310 A128193 A061607
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 11 2011
STATUS
approved

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Last modified February 24 17:27 EST 2024. Contains 370307 sequences. (Running on oeis4.)