A260203 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010001

220, 479, 1857, 5998, 20408, 71846, 245486, 841296, 2905978, 9992478, 34348500, 118254574, 406871094, 1399624310, 4816056622, 16570641810, 57011471540, 196158495144, 674916008534, 2322129167778, 7989626498572, 27489503304114

Offset

1,1

Comments

Column 4 of A260207

Links

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

Formula

Empirical: a(n) = a(n-1) +2*a(n-2) +18*a(n-3) +17*a(n-4) +7*a(n-5) -40*a(n-6) -78*a(n-7) -21*a(n-8) +88*a(n-9) +62*a(n-10) -49*a(n-11) -24*a(n-12) +9*a(n-13) -18*a(n-14) +2*a(n-15) +9*a(n-16) +4*a(n-17) +4*a(n-18) for n>19

Example

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

Crossrefs

Cf. A260207

Sequence in context: A333929 A157107 A175738 * A184543 A234558 A211816

Adjacent sequences: A260200 A260201 A260202 * A260204 A260205 A260206

Keyword

nonn

Author

R. H. Hardin, Jul 19 2015

Status

approved