A196951 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,1,3,4,0 for x=0,1,2,3,4

1, 5, 26, 492, 23956, 3166711, 1147966466, 1139814557483, 3088781045935076, 22873717950695283084, 463109589156291297397232, 25624345402722028725104412700, 3874850344967499961830383314013710

Offset

1,2

Comments

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

Diagonal of A196957

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=4
..0..0..1..1....0..1..0..0....1..1..0..0....1..1..0..1....1..0..0..0
..0..0..0..0....0..1..0..1....0..0..4..0....0..0..0..1....1..0..1..1
..1..0..0..1....0..0..0..1....1..1..0..0....0..0..4..0....0..0..0..0
..1..0..0..1....0..0..0..0....0..0..0..0....1..1..0..0....0..1..1..0

Crossrefs

Sequence in context: A140423 A324419 A090644 * A156217 A156216 A320987

Adjacent sequences: A196948 A196949 A196950 * A196952 A196953 A196954

Keyword

nonn

Author

R. H. Hardin Oct 08 2011

Status

approved