A216025 Number of horizontal, vertical and diagonal neighbor colorings of the odd squares of an nX2 array with new integer colors introduced in row major order

1, 2, 2, 5, 12, 42, 136, 602, 2440, 12840, 61912, 373780, 2075312, 14050312, 87852160, 656404264, 4548247264, 37060650272, 281121815712, 2475181138384, 20358402201792, 192262536609952, 1701534399324544, 17131843186425504

Offset

1,2

Comments

Column 2 of A216031

Links

R. H. Hardin, Table of n, a(n) for n = 1..123

Example

Some solutions for n=5
..x..0....x..0....x..0....x..0....x..0....x..0....x..0....x..0....x..0....x..0
..1..x....0..x....1..x....0..x....1..x....1..x....0..x....0..x....1..x....1..x
..x..2....x..1....x..2....x..1....x..2....x..2....x..1....x..1....x..2....x..2
..0..x....2..x....2..x....2..x....2..x....3..x....1..x....1..x....3..x....3..x
..x..3....x..0....x..0....x..3....x..3....x..4....x..0....x..2....x..1....x..0

Crossrefs

Sequence in context: A181354 A085289 A095339 * A209476 A209178 A209720

Adjacent sequences: A216022 A216023 A216024 * A216026 A216027 A216028

Keyword

nonn

Author

R. H. Hardin Aug 30 2012

Status

approved