A234917 Number of (n+1) X (4+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

1200, 3912, 13336, 55492, 221272, 990956, 4151672, 19178920, 82629808, 389619632, 1717580400, 8224749716, 36995561312, 179190965356, 820121135880, 4004385313088, 18595010158432, 91280836990776, 428929645226328

Offset

1,1

Links

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

R. H. Hardin, Empirical recurrence of order 54

Formula

Empirical recurrence of order 54 (see link above).

Example

Some solutions for n=4:
  4 3 4 0 1       4 3 2 3 4       4 3 0 1 4       1 0 3 0 1
  3 0 3 1 4       1 2 3 2 1       3 4 3 2 3       0 1 2 1 4
  4 3 4 0 1       0 3 2 3 4       4 3 4 1 0       3 2 1 2 3
  3 4 3 1 0       3 4 1 0 3       1 2 1 0 1       2 3 4 3 2
  0 3 4 0 1       0 3 2 3 4       4 3 4 1 0       1 4 3 0 1

Crossrefs

Column 4 of A234921.

Sequence in context: A137261 A252531 A043408 * A167985 A237001 A022056

Adjacent sequences: A234914 A234915 A234916 * A234918 A234919 A234920

Keyword

nonn

Author

R. H. Hardin, Jan 01 2014

Status

approved