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A196898 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,1,0,2 for x=0,1,2,3,4 0
1, 1, 20, 401, 37194, 9855864, 8351540397, 21716826606543, 177451785967252194 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

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

Diagonal of A196904

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A041181 A041762 A196740 * A068772 A230349 A158601

Adjacent sequences:  A196895 A196896 A196897 * A196899 A196900 A196901

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 07 2011

STATUS

approved

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Last modified February 20 20:12 EST 2018. Contains 299385 sequences. (Running on oeis4.)