A260134 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 01010101 or 01010111

266, 730, 2966, 8292, 24696, 85048, 266156, 813540, 2626092, 8360396, 26119048, 82814452, 263115624, 829520604, 2621823280, 8306855180, 26259682284, 83003335876, 262648203728, 830734849888, 2626747254764, 8308477712268

Offset

1,1

Comments

Column 4 of A260138

Links

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

Formula

Empirical: a(n) = a(n-1) +2*a(n-2) +16*a(n-3) +7*a(n-4) -14*a(n-5) -45*a(n-6) -14*a(n-7) +5*a(n-8) +38*a(n-9) +13*a(n-10) -6*a(n-11) -6*a(n-12) for n>13

Example

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

Crossrefs

Cf. A260138

Sequence in context: A348657 A321224 A028528 * A242320 A225935 A205229

Adjacent sequences: A260131 A260132 A260133 * A260135 A260136 A260137

Keyword

nonn

Author

R. H. Hardin, Jul 17 2015

Status

approved