A222272 Number of nX4 0..3 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order

3, 13, 81, 1042, 15309, 259827, 4721919, 86605540, 1596666209, 29636427761, 549614164013, 10257852048210, 190742396582721, 3570677543208821, 66567622846173385, 1248868982288193670, 23339378621029149099

Offset

1,1

Comments

Column 4 of A222275

Links

R. H. Hardin, Table of n, a(n) for n = 1..49

Example

Some solutions for n=3
..0..0..0..1....0..0..0..0....0..0..0..0....0..1..1..1....0..1..0..2
..0..0..0..1....0..1..0..0....0..1..0..0....0..1..1..1....0..0..0..0
..0..0..1..1....2..0..0..0....1..0..0..0....0..1..1..1....0..0..0..0

Crossrefs

Sequence in context: A335588 A089461 A000684 * A057993 A208810 A348116

Adjacent sequences: A222269 A222270 A222271 * A222273 A222274 A222275

Keyword

nonn

Author

R. H. Hardin Feb 14 2013

Status

approved