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A200197 Number of -1..1 arrays x(0..n+2) of n+3 elements with zero sum and nonzero second and third differences. 1
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 5 20:00 EDT 2022. Contains 357261 sequences. (Running on oeis4.)