A260010 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010101 or 01010101

109, 252, 889, 2492, 6944, 18356, 56137, 155304, 457083, 1237656, 3708013, 10156868, 30171658, 82173696, 245127382, 669551372, 1993152025, 5436308892, 16199822928, 44216960412, 131695381211, 359328558160, 1070497238319

Offset

1,1

Comments

Column 3 of A260015

Links

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

Formula

Empirical: a(n) = 4*a(n-2) +37*a(n-4) -13*a(n-6) -124*a(n-8) +12*a(n-10) +72*a(n-12) for n>13

Example

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

Crossrefs

Cf. A260015

Sequence in context: A278784 A256380 A063342 * A142144 A193397 A193395

Adjacent sequences: A260007 A260008 A260009 * A260011 A260012 A260013

Keyword

nonn

Author

R. H. Hardin, Jul 13 2015

Status

approved