A280672 Number of nX7 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.

224, 61880, 16438612, 4460317695, 1208240638772, 327452072560351, 88741877287328326, 24049810737844448684, 6517703746847251930646, 1766353341829714295007100, 478696830022637290656991583

Offset

1,1

Comments

Column 7 of A280673.

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

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

Crossrefs

Cf. A280673.

Sequence in context: A051367 A280960 A076007 * A204977 A204704 A206649

Adjacent sequences: A280669 A280670 A280671 * A280673 A280674 A280675

Keyword

nonn

Author

R. H. Hardin, Jan 07 2017

Status

approved