A240518 Number of nX7 0..1 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..1 introduced in row major order

21, 86, 515, 3765, 28942, 231665, 1906245, 16000486, 135790448, 1158315893, 9946076742, 85823282205, 743139183617, 6451236349918, 56119492560507, 488978060398481, 4265874977466648, 37250999894755072, 325525391487428809

Offset

1,1

Comments

Column 7 of A240519

Links

R. H. Hardin, Table of n, a(n) for n = 1..169

Example

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

Crossrefs

Sequence in context: A045016 A171129 A301540 * A219850 A158540 A304514

Adjacent sequences: A240515 A240516 A240517 * A240519 A240520 A240521

Keyword

nonn

Author

R. H. Hardin, Apr 06 2014

Status

approved