A196572 - OEIS

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A196572

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

1, 1, 16, 145, 8781, 770738, 209244430, 130044352635, 201766678562403, 769785349802611323, 7207100576124898000123, 166275868999956401361788826

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OFFSET

1,3

COMMENTS

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

Diagonal of A196578

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=4

..0..0..3..0....0..0..3..0....0..3..0..0....0..0..3..0....0..0..3..0

..3..0..0..0....0..0..0..3....0..0..0..0....3..0..0..3....3..0..0..3

..0..0..0..0....0..0..0..0....0..0..0..3....0..0..0..0....0..0..0..0

..0..0..0..0....0..0..3..0....0..0..0..0....0..0..3..0....0..0..0..0

CROSSREFS

Sequence in context: A203538 A370849 A076029 * A052388 A027651 A125379

Adjacent sequences: A196569 A196570 A196571 * A196573 A196574 A196575

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 04 2011

STATUS

approved