A200426 Number of -4..4 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero

248, 1830, 11008, 67852, 473034, 3397130, 24220966, 171351382, 1214558880, 8651325238, 61876262346, 443696753874, 3187550880360, 22937925283316, 165329774491030, 1193432351805558, 8626352984960916, 62427556201202018

Offset

1,1

Comments

Column 4 of A200430

Links

R. H. Hardin, Table of n, a(n) for n = 1..183

Example

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

Crossrefs

Sequence in context: A240967 A230856 A109478 * A109476 A121732 A028525

Adjacent sequences: A200423 A200424 A200425 * A200427 A200428 A200429

Keyword

nonn

Author

R. H. Hardin Nov 17 2011

Status

approved