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A234992 Number of (n+1)X(1+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 2, with no adjacent elements equal (constant stress tilted 1X1 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

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

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

Sequence in context: A246475 A202641 A234998 * A213992 A214115 A250968

Adjacent sequences:  A234989 A234990 A234991 * A234993 A234994 A234995

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 02 2014

STATUS

approved

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Last modified January 23 12:51 EST 2022. Contains 350511 sequences. (Running on oeis4.)