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A274724 Number of nX4 0..2 arrays with no element equal to any value at offset (-1,-2) (-2,-1) or (-1,0) and new values introduced in order 0..2. 1
14, 96, 296, 1632, 9308, 52912, 301784, 1721528, 9816048, 55981988, 319253288, 1820657976, 10382921956, 59212245524, 337678318592, 1925727939552, 10982131736244, 62629418453640, 357165995693576, 2036863060347232 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A274728.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +13*a(n-2) +14*a(n-3) +4*a(n-4) -28*a(n-5) -13*a(n-6) -7*a(n-7) +15*a(n-8) for n>12

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A274728.

Sequence in context: A241205 A055844 A308821 * A254469 A296987 A008534

Adjacent sequences:  A274721 A274722 A274723 * A274725 A274726 A274727

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 03 2016

STATUS

approved

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Last modified January 25 00:44 EST 2022. Contains 350565 sequences. (Running on oeis4.)