A280678 Number of 6Xn 0..2 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

122, 34096, 2642832, 287101721, 29920114246, 3130289979912, 327452072560351, 34253681605884733, 3583141682779617309, 374819732160862162533, 39208546724956189523288, 4101465758881532501508232

Offset

1,1

Comments

Row 6 of A280673.

Links

R. H. Hardin, Table of n, a(n) for n = 1..133

Example

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

Crossrefs

Cf. A280673.

Sequence in context: A233016 A282055 A233080 * A209105 A223131 A208256

Adjacent sequences: A280675 A280676 A280677 * A280679 A280680 A280681

Keyword

nonn

Author

R. H. Hardin, Jan 07 2017

Status

approved