A259741 Number of (n+2) X (7+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 or 01010101.

265, 760, 3480, 10570, 35036, 110886, 416107, 1244504, 4489732, 13887332, 50550272, 153892178, 560073447, 1715846404, 6236321603, 19065593974, 69365627376, 212174735776, 771528061749, 2359839029908, 8583078813482

Offset

1,1

Comments

Column 7 of A259742.

Links

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

Formula

Empirical: a(n) = 4*a(n-2) +72*a(n-4) +126*a(n-6) -506*a(n-8) -177*a(n-10) +2157*a(n-12) -663*a(n-14) -6554*a(n-16) +8949*a(n-18) -1807*a(n-20) -4122*a(n-22) +1182*a(n-24) +500*a(n-26) +261*a(n-28) +111*a(n-30) -10*a(n-32) +10*a(n-34) for n>37.

Example

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

Crossrefs

Cf. A259742.

Sequence in context: A255085 A146335 A211714 * A202416 A202471 A202464

Adjacent sequences: A259738 A259739 A259740 * A259742 A259743 A259744

Keyword

nonn

Author

R. H. Hardin, Jul 04 2015

Status

approved