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A199905 Number of -4..4 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, 6, 42, 152, 804, 5016, 24864, 139148, 814776, 4509164, 25781576, 149525280, 856571710, 4954153908, 28801991844, 167153096856, 973462118580, 5682734337828, 33191217303840, 194193233863080, 1137757795417530 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A199909

LINKS

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

EXAMPLE

Some solutions for n=6

..0....3....1....4...-4....4....1....1....2...-2....3....4...-4...-3....2...-2

..2....1...-1...-3....1...-1....0....2...-2....3...-1...-1....4....2...-2....0

.-2...-4....3...-2...-3....3....2...-2....0...-4...-2...-2...-1....1....0....2

.-4....1....4...-1....1....1...-2....0....2...-3....2...-4....1....0....1....0

..1...-1...-3....3....2...-4...-4...-1....1....2...-3....4...-1....1...-1....4

..3....0...-4...-1....3...-3....3....0...-3....4....1...-1....1...-1....0...-4

CROSSREFS

Sequence in context: A164016 A147811 A046763 * A176780 A169938 A082986

Adjacent sequences:  A199902 A199903 A199904 * A199906 A199907 A199908

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 11 2011

STATUS

approved

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Last modified June 4 04:39 EDT 2020. Contains 334815 sequences. (Running on oeis4.)