A259767 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000101

104, 167, 256, 385, 612, 1108, 1708, 2700, 4660, 7378, 11350, 19232, 31280, 48032, 80218, 131336, 202926, 335260, 550228, 857598, 1403502, 2304624, 3618252, 5883582, 9653232, 15248198, 24687220, 40439420, 64203790, 103643474, 169453708

Offset

1,1

Comments

Column 3 of A259770

Links

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

Formula

Empirical: a(n) = 3*a(n-3) +3*a(n-6) +4*a(n-7) -2*a(n-9) +2*a(n-11) -8*a(n-13) +6*a(n-14) for n>17

Example

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

Crossrefs

Cf. A259770

Sequence in context: A298505 A253693 A168528 * A234261 A260288 A044336

Adjacent sequences: A259764 A259765 A259766 * A259768 A259769 A259770

Keyword

nonn

Author

R. H. Hardin, Jul 04 2015

Status

approved