A274754 Number of 7Xn 0..2 arrays with no element equal to any value at offset (-1,-2) (0,-1) or (-1,0) and new values introduced in order 0..2.

32, 729, 10946, 185435, 3140840, 53680592, 920432562, 15806543610, 271711836855, 4671914239590, 80354505513874, 1382068876451987, 23773417216542030, 408926400535170333, 7034177852486985161, 120997474917708497554

Offset

1,1

Comments

Row 7 of A274749.

Links

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

R. H. Hardin, Empirical recurrence of order 80

Formula

Empirical recurrence of order 80 (see link above)

Example

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

Crossrefs

Cf. A274749.

Sequence in context: A060624 A351384 A274857 * A008789 A207996 A284227

Adjacent sequences: A274751 A274752 A274753 * A274755 A274756 A274757

Keyword

nonn

Author

R. H. Hardin, Jul 04 2016

Status

approved