A281467 Number of nX6 0..1 arrays with no element equal to more than two of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

32, 169, 87, 176, 358, 706, 1422, 2858, 5793, 11986, 24812, 51020, 105433, 218415, 451445, 933860, 1933761, 4001344, 8280221, 17142208, 35481002, 73434221, 152010612, 314650743, 651271763, 1348093615, 2790464503, 5775936332

Offset

1,1

Comments

Column 6 of A281469.

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +3*a(n-3) -4*a(n-4) -4*a(n-5) +a(n-6) -a(n-7) +2*a(n-8) +5*a(n-9) -3*a(n-11) for n>17

Example

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

Crossrefs

Cf. A281469.

Sequence in context: A297843 A172191 A304381 * A302621 A302413 A303180

Adjacent sequences: A281464 A281465 A281466 * A281468 A281469 A281470

Keyword

nonn

Author

R. H. Hardin, Jan 22 2017

Status

approved