A275405 Number of 6Xn 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,0) or (-1,1) and new values introduced in order 0..2.

24, 129, 1017, 8122, 65045, 518049, 4142271, 33102260, 264412286, 2112680676, 16879669489, 134861200228, 1077489437845, 8608751763524, 68780667761705, 549531541049837, 4390551455487162, 35078855924532667, 280266876696504422

Offset

1,1

Comments

Row 6 of A275401.

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +28*a(n-2) +137*a(n-3) +222*a(n-4) -178*a(n-5) -1692*a(n-6) -272*a(n-7) +217*a(n-8) +3612*a(n-9) -2256*a(n-10) +1680*a(n-11) -1648*a(n-12) +1472*a(n-13) -192*a(n-14) +512*a(n-15) -256*a(n-16) for n>17

Example

Some solutions for n=4
..0..0..0..0. .0..0..0..1. .0..0..0..0. .0..0..0..1. .0..0..1..2
..1..2..2..0. .2..2..0..1. .1..1..1..1. .2..2..0..0. .2..0..1..0
..1..1..1..1. .1..2..2..2. .2..2..2..2. .1..2..2..2. .1..2..2..0
..2..0..0..1. .0..1..1..2. .0..0..0..2. .0..0..1..1. .0..1..2..2
..2..2..0..0. .0..0..1..1. .1..1..0..0. .2..0..0..0. .0..0..0..1
..1..1..1..2. .1..2..2..0. .2..2..2..1. .1..1..2..2. .2..2..0..0

Crossrefs

Cf. A275401.

Sequence in context: A185490 A293365 A093699 * A223409 A205343 A267631

Adjacent sequences: A275402 A275403 A275404 * A275406 A275407 A275408

Keyword

nonn

Author

R. H. Hardin, Jul 26 2016

Status

approved