A196921 - OEIS

A196921

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

1, 13, 121, 1003, 11843, 123261, 1272060, 13167317, 137002955, 1435498461, 15112707121, 159542157831, 1687279432202, 17865758424479, 189328499039498, 2007534176165707, 21295364228486167, 225957961165658372

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

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

Column 7 of A196922

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

..0..0..0..0..0..0..0....2..2..2..0..0..0..0....0..2..2..2..0..0..0

..0..0..0..0..0..0..0....2..0..2..0..0..0..0....0..2..0..2..0..0..0

..0..0..0..0..0..0..0....2..0..2..0..2..2..0....0..2..0..2..0..4..0

..0..0..0..0..0..0..0....2..2..2..0..2..2..0....0..2..2..2..0..0..0

CROSSREFS

Sequence in context: A014918 A081033 A091111 * A317483 A096053 A033470

Adjacent sequences: A196918 A196919 A196920 * A196922 A196923 A196924

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 07 2011

STATUS

approved