A250224 Number of length n+1 0..3 arrays with the sum of the cubes of adjacent differences multiplied by some arrangement of +-1 equal to zero.

4, 20, 52, 208, 704, 2720, 10952, 45888, 195516, 852260, 3760588, 16656832, 73584076, 323148964, 1409241264, 6099051768, 26171960056, 111250573364, 468230400620, 1951667338228, 8063089066756, 33057662096520, 134680763671240

Offset

1,1

Comments

Column 3 of A250229.

Links

R. H. Hardin, Table of n, a(n) for n = 1..29

Example

Some solutions for n=6
..2....2....3....2....2....2....2....2....0....2....0....2....1....2....2....1
..3....1....2....2....3....1....0....0....0....2....0....2....2....3....2....2
..2....2....2....2....1....3....2....1....0....2....3....3....1....2....1....2
..3....1....1....1....3....3....1....2....1....3....0....2....1....3....0....3
..1....3....2....0....2....3....1....3....2....0....3....3....2....3....1....2
..3....2....3....1....3....1....0....2....0....3....3....2....3....3....0....2
..2....0....3....2....2....0....0....0....2....2....0....2....3....2....0....3

Crossrefs

Cf. A250229.

Sequence in context: A368112 A108099 A244050 * A250272 A023667 A213485

Adjacent sequences: A250221 A250222 A250223 * A250225 A250226 A250227

Keyword

nonn

Author

R. H. Hardin, Nov 14 2014

Status

approved