A261262 Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 00100101 or 01010101.

321, 418, 1483, 4350, 11733, 28540, 85617, 217484, 628033, 1580858, 4617302, 11652770, 33898865, 85532220, 249024281, 628631908, 1828906789, 4618358508, 13433388869, 33933688612, 98664937854, 249321005374, 724680771669

Offset

1,1

Comments

Column 5 of A261265.

Links

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

Formula

Empirical: a(n) = 3*a(n-2) +26*a(n-4) +a(n-5) +42*a(n-6) -2*a(n-7) +7*a(n-8) -8*a(n-9) -52*a(n-10) +13*a(n-11) -40*a(n-12) -25*a(n-13) +33*a(n-14) -14*a(n-15) +11*a(n-16) +17*a(n-17) +14*a(n-18) -7*a(n-19) -14*a(n-20) +12*a(n-21) -10*a(n-23) +4*a(n-25) for n>28

Example

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

Crossrefs

Cf. A261265.

Sequence in context: A174778 A300849 A351994 * A308527 A268517 A228226

Adjacent sequences: A261259 A261260 A261261 * A261263 A261264 A261265

Keyword

nonn

Author

R. H. Hardin, Aug 13 2015

Status

approved