A280901 Number of nX7 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.

34, 184076, 162640161, 91647699996, 42393379206019, 17508860441441769, 6718652421698535725, 2448407789410628918742, 858754574814302324217872, 292445632786957126081923641, 97284552066245842895422600165

Offset

1,1

Comments

Column 7 of A280902.

Links

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

Example

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

Crossrefs

Cf. A280902.

Sequence in context: A243314 A358490 A189649 * A279376 A189311 A189253

Adjacent sequences: A280898 A280899 A280900 * A280902 A280903 A280904

Keyword

nonn

Author

R. H. Hardin, Jan 10 2017

Status

approved