A207810 Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 0 and 1 0 1 vertically

16, 256, 1232, 9168, 57184, 382288, 2485392, 16340928, 106947696, 701265456, 4594672480, 30114026544, 197343497360, 1293310030272, 8475616206320, 55544979901904, 364012404953344, 2385549961744304, 15633651159374128

Offset

1,1

Comments

Row 5 of A207808

Links

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

Formula

Empirical: a(n) = 3*a(n-1) +27*a(n-2) -10*a(n-3) -103*a(n-4) +48*a(n-5) +81*a(n-6) -29*a(n-7) -19*a(n-8) +2*a(n-9) +a(n-10)

Example

Some solutions for n=4
..1..1..0..1....1..1..0..1....1..0..1..0....0..1..0..1....1..0..1..1
..1..1..0..1....0..1..1..0....0..1..0..1....1..0..1..1....0..1..1..0
..1..0..1..0....0..1..1..0....0..1..0..1....1..0..1..0....0..1..1..0
..1..0..1..0....1..0..1..0....1..1..1..1....0..1..0..0....1..0..1..0
..1..1..0..1....1..0..1..1....1..0..1..0....0..1..0..1....1..0..1..1

Crossrefs

Sequence in context: A207256 A207951 A207860 * A208284 A208417 A208025

Adjacent sequences: A207807 A207808 A207809 * A207811 A207812 A207813

Keyword

nonn

Author

R. H. Hardin Feb 20 2012

Status

approved