A196928 Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 1,4,3,2,0 for x=0,1,2,3,4

1, 1, 13, 99, 833, 6755, 55546, 454787, 3731468, 30604579, 251081964, 2059627509, 16896121515, 138603472792, 1137015260752, 9327306512795, 76515112946927, 627679210593852, 5149066137888295, 42239532621052491, 346505218246823715

Offset

1,3

Comments

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

Column 7 of A196929

Links

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

Example

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

Crossrefs

Sequence in context: A201427 A155646 A089936 * A266002 A367554 A326864

Adjacent sequences: A196925 A196926 A196927 * A196929 A196930 A196931

Keyword

nonn

Author

R. H. Hardin Oct 07 2011

Status

approved