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

1540, 19530, 221984, 2567334, 32233938, 410475622, 5230842688, 66651385442, 852399648492, 10942076565344, 140893244263052, 1818559742718468, 23521609925458628, 304795848113641082, 3956133736667718388

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