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A200429 Number of -7..7 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero 1
1540, 19530, 221984, 2567334, 32233938, 410475622, 5230842688, 66651385442, 852399648492, 10942076565344, 140893244263052, 1818559742718468, 23521609925458628, 304795848113641082, 3956133736667718388 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A200430

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..74

EXAMPLE

Some solutions for n=3

..4....0....4...-7...-2...-4...-2....0...-2....4....4....4...-4...-4...-7....0

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

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

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

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

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

CROSSREFS

Sequence in context: A283900 A104167 A237400 * A092717 A203134 A083734

Adjacent sequences:  A200426 A200427 A200428 * A200430 A200431 A200432

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 17 2011

STATUS

approved

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Last modified July 28 23:26 EDT 2021. Contains 346340 sequences. (Running on oeis4.)