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A234992 Number of (n+1) X (1+1) 0..6 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). 1
172, 916, 5280, 31944, 196148, 1214044, 7532324, 46791008, 290776568, 1807339968, 11234293404, 69833627132, 434097609572, 2698436446136, 16774037447840, 104270950787408, 648170340713028, 4029164730233420, 25046145986188500 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A234998.
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) +21*a(n-2) -70*a(n-3) -144*a(n-4) +326*a(n-5) +381*a(n-6) -549*a(n-7) -351*a(n-8) +198*a(n-9) +54*a(n-10).
EXAMPLE
Some solutions for n=5:
4 1 3 4 1 0 1 0 4 1 3 4 4 3 3 4 1 4 0 3
6 5 2 1 0 1 5 2 1 0 1 0 0 1 2 5 0 1 3 4
5 2 5 2 1 4 4 3 5 6 5 2 1 0 3 4 3 6 2 5
6 1 4 3 2 3 5 6 3 2 6 5 0 1 2 5 2 3 5 6
5 2 5 2 6 5 1 0 4 5 5 2 3 2 5 6 6 5 6 5
6 5 1 0 0 1 4 5 1 4 6 5 4 1 0 3 0 1 5 6
CROSSREFS
Column 1 of A234998.
Sequence in context: A246475 A202641 A234998 * A213992 A214115 A250968
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 02 2014
STATUS
approved

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Last modified June 14 11:11 EDT 2024. Contains 373396 sequences. (Running on oeis4.)