login
A199361
Number of nX4 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to one or two horizontal or vertical neighbors
0
0, 5, 23, 2857, 37995, 2838998, 76784986, 4127669738, 153225233815
OFFSET
1,2
COMMENTS
Column 4 of A199363
EXAMPLE
Some solutions for n=3
..0..0..1..2....0..1..1..1....0..0..0..1....0..1..2..2....0..1..2..2
..0..3..1..2....0..2..2..2....2..2..3..1....0..1..2..3....0..1..3..2
..3..3..1..2....0..3..3..3....2..3..3..1....0..1..3..3....0..1..3..3
CROSSREFS
Sequence in context: A299360 A002811 A177134 * A199586 A120488 A309210
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 05 2011
STATUS
approved