A281250 Number of nX5 0..2 arrays with no element equal to more than one of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

2, 1222, 105368, 3291920, 76670685, 1545796513, 28420462973, 491401215701, 8126888074239, 129958666983361, 2024165699180711, 30866308386890563, 462552108806872516, 6831420125251082224, 99653407647500373847

Offset

1,1

Comments

Column 5 of A281251.

Links

R. H. Hardin, Table of n, a(n) for n = 1..43

Example

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

Crossrefs

Cf. A281251.

Sequence in context: A036104 A036106 A285691 * A369777 A171940 A160003

Adjacent sequences: A281247 A281248 A281249 * A281251 A281252 A281253

Keyword

nonn

Author

R. H. Hardin, Jan 18 2017

Status

approved