A252988 Number of (n+2)X(2+2) 0..2 arrays with every consecutive three elements in every row and column having exactly 2 distinct values, in every diagonal 1 or 2 distinct values, in every antidiagonal 2 or 3 distinct values, and new values 0 upwards introduced in row major order

829, 4315, 24001, 136697, 782043, 4486592, 25761550, 147992920, 850428880, 4887217447, 28087368243, 161429119593, 927805560543, 5332571698228, 30649308232987, 176159289551676, 1012491331650746, 5819396661500005

Offset

1,1

Comments

Column 2 of A252993

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..0..1..0..0....0..0..1..0....0..1..0..0....0..0..1..0....0..0..1..0
..0..2..2..1....1..0..0..1....0..2..0..0....2..1..1..0....0..0..2..2
..1..1..0..1....0..1..1..0....1..1..2..1....2..0..0..1....2..2..1..2
..0..1..0..0....0..0..1..1....1..1..0..0....1..1..0..0....0..2..2..0
..0..0..2..0....2..1..2..1....0..2..2..0....2..0..2..0....0..1..1..0
..1..1..0..1....2..1..1..0....1..1..2..1....1..1..0..1....2..2..1..2

Crossrefs

Sequence in context: A238024 A015991 A065215 * A366704 A252415 A252423

Adjacent sequences: A252985 A252986 A252987 * A252989 A252990 A252991

Keyword

nonn

Author

R. H. Hardin, Dec 25 2014

Status

approved