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A207763 Number of 3Xn 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 1 1 and 1 0 1 vertically 2
6, 36, 82, 221, 493, 1095, 2654, 6203, 14182, 33242, 77781, 180207, 419683, 979186, 2277663, 5301348, 12351370, 28755901, 66942929, 155895195, 362997882, 845159395, 1967953186, 4582333234, 10669471213, 24843252803, 57846384111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A207762

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +8*a(n-3) +a(n-5) -12*a(n-6) -3*a(n-7) +a(n-8) +10*a(n-9) -2*a(n-10) -3*a(n-12) for n>14

EXAMPLE

Some solutions for n=4

..1..1..1..0....0..1..1..1....0..1..0..0....1..1..0..0....1..1..1..0

..0..0..1..0....0..1..0..0....1..1..0..0....1..0..0..1....0..0..1..1

..0..0..1..1....0..1..0..0....0..1..1..1....0..0..1..0....0..0..1..0

CROSSREFS

Sequence in context: A207483 A207264 A207270 * A207347 A207769 A207896

Adjacent sequences:  A207760 A207761 A207762 * A207764 A207765 A207766

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 19 2012

STATUS

approved

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Last modified December 1 16:44 EST 2021. Contains 349430 sequences. (Running on oeis4.)