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A235171 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 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). 1
8688, 45776, 240020, 1264228, 6664620, 35209872, 186233144, 986928332, 5236116224, 27831579620, 148096235716, 789461093804, 4212865815920, 22520692982832, 120511765742428, 645968908638908, 3465944872151148 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

EXAMPLE

Some solutions for n=2:

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

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

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

CROSSREFS

Column 3 of A235175.

Sequence in context: A214487 A254697 A242140 * A237875 A237876 A237874

Adjacent sequences:  A235168 A235169 A235170 * A235172 A235173 A235174

KEYWORD

nonn,changed

AUTHOR

R. H. Hardin, Jan 04 2014

STATUS

approved

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Last modified June 26 04:25 EDT 2022. Contains 354877 sequences. (Running on oeis4.)