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A235307 Number of (n+1) X (5+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 6 (constant-stress 1 X 1 tilings). 1
4006, 6786, 10790, 21090, 38182, 83394, 168998, 400674, 889126, 2238786, 5323430, 14015010, 35074342, 95480514, 248156198, 692867874, 1852387366, 5272270146, 14401045670, 41585674530, 115480062502, 337084349634, 948148162598 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A235310.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +25*a(n-2) -112*a(n-3) -231*a(n-4) +1260*a(n-5) +875*a(n-6) -7280*a(n-7) -224*a(n-8) +22736*a(n-9) -7980*a(n-10) -36288*a(n-11) +21456*a(n-12) +23040*a(n-13) -17280*a(n-14).

EXAMPLE

Some solutions for n=5:

  1 4 1 4 1 5    4 0 4 0 4 1    2 4 1 5 2 4    2 5 2 5 1 5

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

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

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

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

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

CROSSREFS

Sequence in context: A034306 A228579 A252328 * A193552 A107285 A252349

Adjacent sequences:  A235304 A235305 A235306 * A235308 A235309 A235310

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified September 24 12:26 EDT 2022. Contains 356932 sequences. (Running on oeis4.)