A200428 Number of -6..6 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero

940, 10250, 98052, 955602, 10217182, 111101654, 1206988576, 13090995142, 142480007436, 1556876199472, 17066756670292, 187540784116604, 2065041046363200, 22780124416681858, 251710751862388016

Offset

1,1

Comments

Column 6 of A200430

Links

R. H. Hardin, Table of n, a(n) for n = 1..64

Example

Some solutions for n=3
.-5...-4...-4....2...-5....6....4...-1...-4....1...-4....5....6....3....0...-6
..3....1....3...-5...-2....2....6....0....2...-2...-4...-1...-5....2....3...-4
..0....1...-4...-5....3....1...-3....6...-1...-2....1...-5....2....1....2....5
.-4...-3....2....3....2...-5...-2....5....6....5....6....2...-6...-5...-3....4
..2...-1....5....1....5....1...-3...-4....1....1...-1...-3....2...-5....0....4
..4....6...-2....4...-3...-5...-2...-6...-4...-3....2....2....1....4...-2...-3

Crossrefs

Sequence in context: A031902 A204072 A259641 * A104917 A358689 A052238

Adjacent sequences: A200425 A200426 A200427 * A200429 A200430 A200431

Keyword

nonn

Author

R. H. Hardin Nov 17 2011

Status

approved