A200197 Number of -1..1 arrays x(0..n+2) of n+3 elements with zero sum and nonzero second and third differences.

12, 22, 50, 90, 192, 360, 752, 1472, 3060, 6104, 12596, 25368, 52230, 106038, 218204, 445350, 916598, 1877598, 3866920, 7942794, 16372182, 33699352, 69526894, 143344944, 296012610, 611113112, 1263073756, 2610512928, 5399923198

Offset

1,1

Comments

Column 1 of A200204.

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

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

Crossrefs

Cf. A200204.

Sequence in context: A115745 A129639 A153361 * A115709 A115703 A014633

Adjacent sequences: A200194 A200195 A200196 * A200198 A200199 A200200

Keyword

nonn

Author

R. H. Hardin Nov 14 2011

Status

approved