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A269038 Number of 4Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once. 1
0, 504, 2136, 18384, 115656, 785124, 4998648, 31834476, 198736752, 1231177296, 7552688064, 46020487500, 278641166280, 1678349335044, 10062618187272, 60089435895360, 357550261665528, 2120806295463156, 12543856834626072 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A269035.

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) +23*a(n-2) -102*a(n-3) -288*a(n-4) +250*a(n-5) +787*a(n-6) -238*a(n-7) -741*a(n-8) +124*a(n-9) +196*a(n-10) -16*a(n-11) -16*a(n-12) for n>14

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A269035.

Sequence in context: A060666 A226265 A277114 * A161005 A259953 A180164

Adjacent sequences:  A269035 A269036 A269037 * A269039 A269040 A269041

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 18 2016

STATUS

approved

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Last modified July 5 20:21 EDT 2020. Contains 335473 sequences. (Running on oeis4.)