A200427 Number of -5..5 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero

520, 4750, 36952, 293464, 2591502, 23380862, 210222830, 1882624856, 16911040968, 152565274262, 1381204433968, 12534862082614, 113983746333928, 1038347313892636, 9474508237939826, 86579678278534962, 792234931151418444

Offset

1,1

Comments

Column 5 of A200430

Links

R. H. Hardin, Table of n, a(n) for n = 1..130

Example

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

Crossrefs

Sequence in context: A147856 A094903 A250693 * A250678 A178269 A351324

Adjacent sequences: A200424 A200425 A200426 * A200428 A200429 A200430

Keyword

nonn

Author

R. H. Hardin Nov 17 2011

Status

approved