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A235253 Number of (n+1) X (3+1) 0..7 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 7, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). 1
2672, 8328, 24232, 80812, 251656, 878988, 2873128, 10362212, 35132248, 129681452, 452445096, 1699526196, 6067071432, 23102391980, 84025709016, 323468947012, 1194691128744, 4640522916700, 17359355152040, 67935545177540 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A235258.

LINKS

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

R. H. Hardin, Empirical recurrence of order 57

FORMULA

Empirical recurrence of order 57 (see link above).

EXAMPLE

Some solutions for n=4:

  6 0 6 2     1 0 3 1     1 5 1 5     3 1 3 0     6 5 6 5

  0 1 0 3     0 6 2 7     5 2 5 2     2 7 2 6     0 6 0 6

  6 0 6 2     3 2 5 3     3 7 3 7     6 4 6 3     5 4 5 4

  2 3 2 5     0 6 2 7     4 1 4 1     2 7 2 6     1 7 1 7

  7 1 7 3     1 0 3 1     1 5 1 5     5 3 5 2     6 5 6 5

CROSSREFS

Sequence in context: A010088 A252301 A250855 * A309762 A344192 A345896

Adjacent sequences:  A235250 A235251 A235252 * A235254 A235255 A235256

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified August 18 02:34 EDT 2022. Contains 356204 sequences. (Running on oeis4.)