A280906 Number of 5Xn 0..2 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

0, 1464, 610448, 75809243, 7083739466, 574982226478, 42393379206019, 2942502897692141, 195365303234441770, 12545498025247203218, 784842927161230385854, 48079317345677228680390, 2894948350054066836940824

Offset

1,2

Comments

Row 5 of A280902.

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

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

Crossrefs

Cf. A280902.

Sequence in context: A164647 A284887 A237483 * A321010 A278368 A206862

Adjacent sequences: A280903 A280904 A280905 * A280907 A280908 A280909

Keyword

nonn

Author

R. H. Hardin, Jan 10 2017

Status

approved