A196281 - OEIS

A196281

Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,0,3,1,4 for x=0,1,2,3,4.

1, 5, 7, 335, 3621, 193137, 13307143, 3369153109, 1022753961763, 921078606743691

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OFFSET

1,2

COMMENTS

Every 0 is next to 0 2's, every 1 is next to 1 0's, every 2 is next to 2 3's, every 3 is next to 3 1's, every 4 is next to 4 4's

Diagonal of A196287

LINKS

EXAMPLE

Some solutions for n=4

..1..3..1..0....1..3..1..0....0..0..1..1....0..0..1..1....1..0..1..1

..0..1..3..0....0..1..1..0....1..3..1..0....1..1..1..0....3..1..1..0

..1..1..1..1....0..3..1..0....1..1..1..1....3..1..3..1....1..1..1..1

..1..0..0..1....0..1..1..0....0..0..0..1....1..0..0..1....0..0..0..1

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 30 2011

STATUS

approved