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A199908 Number of -7..7 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not equal modulo three (with -1 modulo 3 = 2) 1
1, 10, 114, 680, 6064, 62776, 518560, 4854740, 47329800, 436295060, 4163000530, 40224691008, 383919683336, 3702037559404, 35864644194258, 346836775041832, 3366637367524806, 32752033994479420, 318790073410891420 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 7 of A199909

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for n=6

.-2...-1....2...-7...-5...-2...-2...-2...-4...-5...-2...-4...-2...-3....4....0

.-1....7....7....1...-6....5...-1...-1....1...-3....5...-3....3...-7....3...-7

..4....0....5....2....5...-3....6...-6...-6....5....6....7....4....1...-1....4

.-1...-5...-5....6...-5....2...-7...-4....4...-5....2....5...-3....6...-5....2

..1....3...-7....1....6...-2....0....7....0....3...-5...-2....4...-4...-4...-5

.-1...-4...-2...-3....5....0....4....6....5....5...-6...-3...-6....7....3....6

CROSSREFS

Sequence in context: A024130 A176824 A196983 * A185391 A104520 A138845

Adjacent sequences:  A199905 A199906 A199907 * A199909 A199910 A199911

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 11 2011

STATUS

approved

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Last modified January 26 23:05 EST 2020. Contains 331289 sequences. (Running on oeis4.)