A196577 Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 1,2,3,0,4 for x=0,1,2,3,4.

1, 99, 1168, 24837, 543386, 10178170, 209244430, 4167002491, 83787848176, 1681864142052, 33715043534659, 676668917550412, 13575612361397730, 272363323225958600, 5464598861897357432, 109637123653049520937

Offset

1,2

Comments

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

Column 7 of A196578

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

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

Crossrefs

Sequence in context: A249335 A338258 A201044 * A259693 A196785 A196808

Adjacent sequences: A196574 A196575 A196576 * A196578 A196579 A196580

Keyword

nonn

Author

R. H. Hardin, Oct 04 2011

Status

approved