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A195970 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,0,1,3,4 for x=0,1,2,3,4 0
1, 9, 24, 67, 244, 1280, 5637, 32909, 212185, 1609756, 13476199, 134461394 (list; graph; refs; listen; history; text; internal format)
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 1's, every 3 is next to 3 3's, every 4 is next to 4 4's

Diagonal of A195978

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A297225 A258438 A038626 * A223372 A180334 A223290

Adjacent sequences: A195967 A195968 A195969 * A195971 A195972 A195973

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 25 2011

STATUS

approved

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Last modified December 1 23:44 EST 2022. Contains 358485 sequences. (Running on oeis4.)