A260012 Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010101 or 01010101

436, 1232, 6944, 25600, 87024, 294336, 1231648, 4380288, 16773440, 58243968, 231701952, 814232832, 3185356416, 11129195264, 43863022976, 153683692032, 603684726016, 2112267329024, 8309822447360, 29094787617792, 114381212785152

Offset

1,1

Comments

Column 5 of A260015

Links

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

Formula

Empirical: a(n) = 8*a(n-2) +108*a(n-4) -288*a(n-6) -1828*a(n-8) +4768*a(n-10) +4128*a(n-12) -11008*a(n-14) -4608*a(n-16) +4096*a(n-18) for n>21

Example

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

Crossrefs

Cf. A260015

Sequence in context: A345808 A260366 A250781 * A234221 A255777 A283928

Adjacent sequences: A260009 A260010 A260011 * A260013 A260014 A260015

Keyword

nonn

Author

R. H. Hardin, Jul 13 2015

Status

approved