A260926 Number of (n+2) X (7+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101.

883, 1528, 7680, 25690, 82766, 253264, 971381, 2901724, 10470430, 32212024, 118158061, 357207408, 1307239067, 3983812562, 14565958591, 44252940160, 161970281879, 492560981246, 1801700119918, 5477908769440, 20043051801535

Offset

1,1

Comments

Column 7 of A260927.

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

Crossrefs

Cf. A260927.

Sequence in context: A207579 A207054 A096992 * A129470 A129471 A023312

Adjacent sequences: A260923 A260924 A260925 * A260927 A260928 A260929

Keyword

nonn

Author

R. H. Hardin, Aug 04 2015

Status

approved