A260922 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00101011 or 01010101

104, 146, 401, 896, 1800, 3358, 7680, 14924, 32431, 62992, 139263, 269060, 591945, 1148020, 2528065, 4893596, 10776857, 20877196, 45968189, 89026604, 196045769, 379710316, 836112021, 1619399516, 3565959873, 6906609340, 15208409269

Offset

1,1

Comments

Column 3 of A260927

Links

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

Formula

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

Example

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

Crossrefs

Cf. A260927

Sequence in context: A052476 A297912 A253700 * A054903 A074228 A298505

Adjacent sequences: A260919 A260920 A260921 * A260923 A260924 A260925

Keyword

nonn

Author

R. H. Hardin, Aug 04 2015

Status

approved