A260976 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101

483, 481, 732, 1513, 2714, 5506, 9728, 18578, 33658, 66832, 122644, 237212, 431888, 836918, 1545484, 2982194, 5509198, 10561098, 19597590, 37523150, 69861252, 133304344, 248584050, 473406314, 884926304, 1682544698, 3149522270

Offset

1,1

Comments

Column 4 of A260980

Links

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

Formula

Empirical: a(n) = 2*a(n-2) +4*a(n-4) +5*a(n-5) -5*a(n-7) -2*a(n-8) -12*a(n-9) +7*a(n-10) +11*a(n-11) +2*a(n-12) +a(n-13) -4*a(n-15) -11*a(n-16) -8*a(n-17) -a(n-18) -4*a(n-19) for n>26

Example

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

Crossrefs

Cf. A260980

Sequence in context: A231395 A263291 A121734 * A281047 A158330 A288082

Adjacent sequences: A260973 A260974 A260975 * A260977 A260978 A260979

Keyword

nonn

Author

R. H. Hardin, Aug 06 2015

Status

approved