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A234438 Number of (n+1)X(3+1) 0..2 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 1 (constant stress 1X1 tilings) 1
448, 2804, 17200, 108404, 666880, 4221580, 26023136, 165444308, 1021780992, 6523295060, 40358959904, 258707287924, 1603224318880, 10317081808148, 64032676563232, 413605116397892, 2570619151590496, 16663502963008084 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A234443

LINKS

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

FORMULA

Empirical: a(n) = 119*a(n-2) -4884*a(n-4) +76112*a(n-6) -295366*a(n-8) +424128*a(n-10) -242512*a(n-12) +58736*a(n-14) -4992*a(n-16)

EXAMPLE

Some solutions for n=4

..1..2..0..2....1..0..0..0....1..2..0..1....1..2..2..0....2..0..1..1

..1..1..0..1....1..1..2..1....2..2..1..1....0..0..1..0....2..1..1..0

..1..2..2..2....1..0..2..0....2..1..1..0....0..1..1..1....1..1..2..2

..1..1..0..1....0..0..1..0....2..2..1..1....2..2..1..0....2..1..1..2

..1..2..0..0....1..2..2..2....2..1..1..0....0..1..1..1....1..1..0..2

CROSSREFS

Sequence in context: A251646 A235177 A194648 * A048632 A234428 A234424

Adjacent sequences:  A234435 A234436 A234437 * A234439 A234440 A234441

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 26 2013

STATUS

approved

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Last modified January 23 16:48 EST 2020. Contains 331173 sequences. (Running on oeis4.)