A260923 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101

186, 279, 896, 2208, 4522, 10617, 25690, 58606, 134296, 314471, 729920, 1686078, 3909750, 9081515, 21033032, 48765365, 113054330, 262238504, 607643220, 1409411303, 3266491942, 7576260468, 17557722330, 40724481666, 94379231110

Offset

1,1

Comments

Column 4 of A260927

Links

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

Formula

Empirical: a(n) = a(n-2) +18*a(n-4) +32*a(n-6) -7*a(n-8) -33*a(n-10) +13*a(n-12) +25*a(n-14) -28*a(n-16) +9*a(n-18) -a(n-20) for n>22

Example

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

Crossrefs

Cf. A260927

Sequence in context: A189941 A362811 A363681 * A151701 A258276 A286006

Adjacent sequences: A260920 A260921 A260922 * A260924 A260925 A260926

Keyword

nonn

Author

R. H. Hardin, Aug 04 2015

Status

approved