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A208416 Number of nX4 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 1 vertically 1
10, 100, 378, 1269, 3835, 10098, 26375, 65178, 157734, 378262, 891503, 2096679, 4903388, 11430925, 26635182, 61947132, 144056682, 334894773, 778319859, 1809079118, 4204482395, 9772110046, 22713444310, 52793388462, 122714964255 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A208420

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) -10*a(n-3) -15*a(n-4) +40*a(n-5) +19*a(n-6) -25*a(n-7) -60*a(n-8) +32*a(n-9) -10*a(n-10) +29*a(n-11) +28*a(n-12) +43*a(n-13) -83*a(n-14) -24*a(n-15) +4*a(n-16) +30*a(n-17) -13*a(n-18) +20*a(n-19) +a(n-20) -3*a(n-21) -8*a(n-22) +4*a(n-23) -2*a(n-24) -a(n-25) +a(n-27)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207859 A207809 A208283 * A208024 A207804 A060522

Adjacent sequences:  A208413 A208414 A208415 * A208417 A208418 A208419

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 26 2012

STATUS

approved

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Last modified October 22 07:06 EDT 2021. Contains 348160 sequences. (Running on oeis4.)