A260135 Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 01010101 or 01010111

472, 1626, 7698, 24696, 89000, 365308, 1340176, 4872072, 18722120, 70481648, 261099100, 983277524, 3703246800, 13842606580, 51913534988, 195076841960, 731304173564, 2741911934968, 10290873860440, 38603457828044

Offset

1,1

Comments

Column 5 of A260138

Links

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

Formula

Empirical: a(n) = a(n-1) +2*a(n-2) +33*a(n-3) +20*a(n-4) -18*a(n-5) -257*a(n-6) -260*a(n-7) -44*a(n-8) +912*a(n-9) +798*a(n-10) +241*a(n-11) -1094*a(n-12) -868*a(n-13) -450*a(n-14) +667*a(n-15) +251*a(n-16) +158*a(n-17) -247*a(n-18) -19*a(n-19) +25*a(n-20) +81*a(n-21) +7*a(n-22) -8*a(n-24) for n>25

Example

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

Crossrefs

Cf. A260138

Sequence in context: A345798 A235287 A260102 * A259640 A187161 A249534

Adjacent sequences: A260132 A260133 A260134 * A260136 A260137 A260138

Keyword

nonn

Author

R. H. Hardin, Jul 17 2015

Status

approved