A197206 Number of n X 7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,2,1,0,3 for x=0,1,2,3,4.

9, 1601, 135560, 11746093, 1024514869, 89745742142, 7876891407951, 690021326042559, 60491817588808916, 5301646194878359081, 464649371771178476930, 40726185128716590636286, 3569576115816506857804441, 312860754320377863828369661, 27421313658292074061636017063

Offset

1,1

Comments

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

Links

R. H. Hardin, Table of n, a(n) for n = 1..54

Example

Some solutions for n=4:
..0..0..0..2..1..0..0....0..0..0..3..0..1..2....0..0..1..2..1..0..1
..0..0..0..1..0..0..0....0..0..0..0..3..0..1....0..0..0..3..0..3..2
..0..0..2..1..0..3..0....0..1..2..2..1..1..0....0..0..0..0..3..0..1
..0..0..1..1..2..1..0....0..0..1..1..0..2..1....0..0..0..0..1..2..1

Crossrefs

Column 7 of A197207.

Sequence in context: A187131 A167774 A381197 * A197804 A047944 A322245

Adjacent sequences: A197203 A197204 A197205 * A197207 A197208 A197209

Keyword

nonn

Author

R. H. Hardin, Oct 11 2011

Status

approved