A263113 Number of (n+2)X(1+2) 0..1 arrays with each row and column not divisible by 7, read as a binary number with top and left being the most significant bits.

102, 690, 4614, 28626, 173010, 1049016, 6331494, 37989042, 228197310, 1370694210, 8222465730, 49340098992, 296102474742, 1776497631810, 10659057309654, 63956883880626, 383735173287090, 2302409993685096, 13814564261860614

Offset

1,1

Comments

Column 1 of A263117.

Links

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

Formula

Empirical: a(n) = 6*a(n-1) +72*a(n-3) -432*a(n-4) -1270*a(n-6) +7620*a(n-7) -2880*a(n-9) +17280*a(n-10) +113591*a(n-12) -681546*a(n-13) +115128*a(n-15) -690768*a(n-16)

Example

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

Crossrefs

Cf. A263117.

Sequence in context: A158127 A231361 A263117 * A231454 A230704 A151964

Adjacent sequences: A263110 A263111 A263112 * A263114 A263115 A263116

Keyword

nonn

Author

R. H. Hardin, Oct 09 2015

Status

approved