A261379 Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00001011 00010101 or 01010101.

392, 864, 3778, 12500, 39494, 128998, 461576, 1468008, 5004588, 16267396, 56289594, 180787146, 623643757, 2013680076, 6945409809, 22381289794, 77243050853, 249062829770, 859199611263, 2770077481724, 9558157038040

Offset

1,1

Comments

Column 7 of A261380.

Links

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

Formula

Empirical: a(n) = a(n-2) +91*a(n-4) +334*a(n-6) -779*a(n-8) -3685*a(n-10) +7226*a(n-12) +20922*a(n-14) -62627*a(n-16) -27148*a(n-18) +249596*a(n-20) -142965*a(n-22) -601602*a(n-24) +1185157*a(n-26) -586527*a(n-28) -552103*a(n-30) +736485*a(n-32) -49406*a(n-34) -272061*a(n-36) +63499*a(n-38) +50155*a(n-40) -1001*a(n-42) -4198*a(n-44) -4416*a(n-46) -1042*a(n-48) -51*a(n-50) -100*a(n-52) -10*a(n-54) for n>59

Example

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

Crossrefs

Cf. A261380.

Sequence in context: A035883 A235188 A248022 * A235313 A203917 A180295

Adjacent sequences: A261376 A261377 A261378 * A261380 A261381 A261382

Keyword

nonn

Author

R. H. Hardin, Aug 17 2015

Status

approved