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A274852 Number of n X n 0..2 arrays with no element equal to any value at offset (-1,0) (0,-1) or (-2,-2) and new values introduced in order 0..2. 1
1, 3, 19, 118, 1085, 14414, 289494, 8474549, 367622030, 23768683063, 2264991184042, 321683159101264, 67771416854833971, 21147805661160867290, 9831636745023577739551, 6777168866402222336954286 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A274858.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..17

EXAMPLE

Some solutions for n=4

..0..1..2..1. .0..1..2..0. .0..1..2..1. .0..1..0..2. .0..1..0..1

..2..0..1..2. .1..2..0..1. .1..0..1..2. .1..0..2..0. .2..0..1..2

..0..1..2..0. .2..0..1..0. .0..1..2..0. .0..2..1..2. .0..1..2..0

..2..0..1..2. .0..2..0..1. .1..2..0..1. .1..0..2..1. .1..2..1..2

CROSSREFS

Cf. A274858.

Sequence in context: A290477 A321002 A221184 * A139176 A302443 A126809

Adjacent sequences: A274849 A274850 A274851 * A274853 A274854 A274855

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 09 2016

STATUS

approved

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Last modified February 4 12:59 EST 2023. Contains 360055 sequences. (Running on oeis4.)