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A269031 Number of nX4 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once. 1
36, 216, 2166, 18384, 146064, 1114848, 8277072, 60218112, 431354928, 3052215072, 21383561232, 148585984320, 1025363155440, 7034327057760, 48013557090768, 326276117933952, 2208609401649072, 14899002865010592, 100198549907000208 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A269035.

LINKS

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

FORMULA

Empirical: a(n) = 14*a(n-1) -57*a(n-2) +56*a(n-3) -16*a(n-4) for n>5

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A269035.

Sequence in context: A230470 A066610 A176696 * A113164 A237252 A017234

Adjacent sequences:  A269028 A269029 A269030 * A269032 A269033 A269034

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 18 2016

STATUS

approved

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Last modified October 16 08:40 EDT 2018. Contains 316259 sequences. (Running on oeis4.)