A249975 Number of length n+1 0..2*1 arrays with the sum of the absolute values of adjacent differences equal to n*1

4, 10, 20, 64, 136, 466, 1012, 3580, 7864, 28340, 62696, 228700, 508400, 1870466, 4172660, 15449740, 34557400, 128583340, 288212440, 1076603824, 2417218544, 9058241620, 20366034760, 76521687304, 172247070064, 648634854904

Offset

1,1

Comments

Column 1 of A249982

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A015220 A047199 A038065 * A306158 A339784 A277970

Adjacent sequences: A249972 A249973 A249974 * A249976 A249977 A249978

Keyword

nonn

Author

R. H. Hardin, Nov 10 2014

Status

approved