A199242 Number of nX4 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors

3, 12, 25, 440, 2907, 7100, 134821, 934004, 2277108, 46296108, 330908530, 820702285, 17258404593, 125752465794, 315014793177, 6765057712760, 49918706666467, 125910537922412, 2743415189299833, 20425391744058298

Offset

1,1

Comments

Column 4 of A199246

Links

R. H. Hardin, Table of n, a(n) for n = 1..30

Example

Some solutions for n=5
..0..1..2..1....0..1..0..2....0..1..0..1....0..0..1..0....0..1..0..1
..2..0..1..2....2..2..1..0....1..2..1..2....0..0..2..1....1..0..1..2
..0..2..0..1....2..2..0..1....2..1..2..0....1..2..1..0....0..2..0..1
..2..0..1..0....0..1..1..2....0..2..0..2....2..1..2..1....2..0..2..0
..1..2..0..1....2..1..1..0....1..0..2..0....1..2..0..2....1..2..1..2

Crossrefs

Sequence in context: A071355 A366984 A237650 * A326725 A169678 A294366

Adjacent sequences: A199239 A199240 A199241 * A199243 A199244 A199245

Keyword

nonn

Author

R. H. Hardin Nov 04 2011

Status

approved