A260760 Number of (n+2)X(1+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010011

48, 82, 190, 350, 622, 1315, 2478, 4597, 9184, 17591, 33096, 64829, 124590, 236647, 458914, 883290, 1686838, 3255660, 6266216, 12003508, 23114992, 44476139, 85340062, 164169628, 315782978, 606459354, 1166124310, 2242522630, 4308761510

Offset

1,1

Comments

Column 1 of A260767

Links

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

Formula

Empirical: a(n) = 4*a(n-3) +3*a(n-4) +2*a(n-5) +5*a(n-6) +5*a(n-8) +2*a(n-9) +3*a(n-10) +4*a(n-11) +2*a(n-12) +6*a(n-13) +a(n-14) for n>15

Example

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

Crossrefs

Cf. A260767

Sequence in context: A260767 A211722 A260834 * A260501 A260494 A039426

Adjacent sequences: A260757 A260758 A260759 * A260761 A260762 A260763

Keyword

nonn

Author

R. H. Hardin, Jul 30 2015

Status

approved