A196642 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 1,3,4,0,2 for x=0,1,2,3,4

1, 1, 16, 129, 4273, 217880, 23946130, 5094296927, 2171426372387, 1837082082523359, 3094534584891471987, 10360619358796873163844, 68989834793646571143250669, 913590557002024874434691467840

Offset

1,3

Comments

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

Diagonal of A196646

Links

Table of n, a(n) for n=1..14.

Example

Some solutions for n=4
..0..0..0..0....0..0..3..0....0..0..0..0....0..0..0..0....0..0..3..0
..0..3..0..3....0..0..0..0....3..0..3..0....0..0..0..0....3..0..0..0
..0..3..0..0....3..0..0..3....0..0..3..0....0..3..3..0....0..3..3..0
..0..0..3..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0

Crossrefs

Sequence in context: A031156 A099195 A041486 * A196595 A055914 A255816

Adjacent sequences: A196639 A196640 A196641 * A196643 A196644 A196645

Keyword

nonn

Author

R. H. Hardin Oct 04 2011

Status

approved