A196740 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,3,1,0,4 for x=0,1,2,3,4

1, 1, 20, 401, 35202, 7942712, 5423213789, 10714890351493, 61977591097741664, 1045534716234234877628, 51543884247862488090471612

Offset

1,3

Comments

Every 0 is next to 0 2'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 4's

Diagonal of A196746

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=4
..0..0..0..0....0..0..0..0....0..3..0..0....0..0..0..0....0..3..0..0
..0..0..0..0....0..0..0..3....0..0..0..0....3..0..0..3....0..0..0..0
..3..0..0..0....1..3..0..0....3..0..3..1....0..0..0..0....1..3..0..3
..0..0..3..0....0..0..0..0....0..3..0..0....0..3..0..0....0..0..3..0

Crossrefs

Sequence in context: A223180 A041181 A041762 * A196898 A355966 A068772

Adjacent sequences: A196737 A196738 A196739 * A196741 A196742 A196743

Keyword

nonn

Author

R. H. Hardin Oct 06 2011

Status

approved