A216026 Number of horizontal, vertical and diagonal neighbor colorings of the odd squares of an nX3 array with new integer colors introduced in row major order

1, 2, 4, 29, 97, 1534, 7050, 188835, 1084180, 42756208, 291120551, 15590248868, 121920095674, 8414029179365, 73953763887277, 6340176007793060, 61657373569634586, 6390402969619162909, 67948766672072844798

Offset

1,2

Comments

Column 3 of A216031

Links

R. H. Hardin, Table of n, a(n) for n = 1..41

Example

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

Crossrefs

Sequence in context: A018291 A033167 A081464 * A241589 A289776 A290169

Adjacent sequences: A216023 A216024 A216025 * A216027 A216028 A216029

Keyword

nonn

Author

R. H. Hardin Aug 30 2012

Status

approved