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A235305 Number of (n+1) X (3+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
518, 1106, 2118, 5042, 10790, 27602, 64326, 172658, 428198, 1187666, 3077958, 8734322, 23346470, 67327442, 183958086, 536636018, 1489810598, 4381851986, 12310550598, 36420793202, 103261907750, 306776867282, 876096133446 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 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:

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

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

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

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

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

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

CROSSREFS

Sequence in context: A116013 A225913 A233054 * A253308 A043380 A345578

Adjacent sequences: A235302 A235303 A235304 * A235306 A235307 A235308

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified December 2 14:15 EST 2022. Contains 358510 sequences. (Running on oeis4.)