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URL: https://oeis.org/A270051

⇱ A270051 - OEIS

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A270051

Number of n X n 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.

0

0, 240, 385200, 4410058320, 446901694424400, 431802177781617762960, 4120579270516550893026428880, 396051988194462616335989531581823280, 388077749523667550173285586776073430011586480

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OFFSET

1,2

COMMENTS

Diagonal of A270058.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=2

..1..2. .0..3. .2..2. .1..1. .3..0. .1..2. .1..0. .0..4. .1..0. .2..3

..3..4. .0..1. .4..1. .4..3. .2..2. .4..0. .3..2. .0..2. .1..4. .2..3

CROSSREFS

Sequence in context: A047806 A184888 A158792 * A028678 A159950 A198481

Adjacent sequences: A270048 A270049 A270050 * A270052 A270053 A270054

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 09 2016

STATUS

approved