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A207713 Number of nX4 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 0 0 vertically 1
10, 100, 450, 2205, 11970, 66946, 383845, 2221688, 12947130, 75691595, 443447550, 2600917830, 15265923595, 89639239300, 526483671750, 3092701866155, 18169057652502, 106746028836790, 627171773700111, 3684942718387344 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A207717

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +6*a(n-2) -138*a(n-3) +52*a(n-4) +850*a(n-5) -487*a(n-6) -2284*a(n-7) +1340*a(n-8) +2858*a(n-9) -1584*a(n-10) -1736*a(n-11) +885*a(n-12) +500*a(n-13) -238*a(n-14) -60*a(n-15) +28*a(n-16) +2*a(n-17) -a(n-18) for n>19

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A208289 A208365 A208144 * A222716 A111434 A208074

Adjacent sequences:  A207710 A207711 A207712 * A207714 A207715 A207716

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 19 2012

STATUS

approved

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Last modified July 4 22:49 EDT 2022. Contains 355086 sequences. (Running on oeis4.)