A252805 Number of (n+2) X (2+2) 0..4 arrays with every consecutive three elements in every row and column not having exactly two distinct values, and in every diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order.

155, 259, 488, 369, 702, 2301, 1864, 3971, 13398, 11033, 23486, 78603, 66024, 139811, 462262, 397385, 835886, 2723707, 2404648, 5019491, 16081590, 14635481, 30289406, 95177547, 89643528, 183775811, 564866134, 552873161, 1121777966, 3363196795

Offset

1,1

Comments

Column 2 of A252811.

Links

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

Formula

Empirical: a(n) = a(n-1) +13*a(n-3) -13*a(n-4) -43*a(n-6) +43*a(n-7) +7*a(n-9) -7*a(n-10) for n>16.

Example

Some solutions for n=2
..0..1..2..0....0..1..2..0....0..1..2..0....0..1..2..3....0..1..2..3
..3..0..2..1....3..0..2..4....1..0..2..3....1..2..4..0....1..3..0..2
..2..2..2..2....2..2..2..2....2..2..2..2....3..4..0..1....2..0..3..1
..0..1..2..0....1..4..2..0....4..3..2..0....0..3..1..2....4..2..1..0

Crossrefs

Cf. A252811.

Sequence in context: A214472 A259379 A122475 * A089256 A112136 A119609

Adjacent sequences: A252802 A252803 A252804 * A252806 A252807 A252808

Keyword

nonn

Author

R. H. Hardin, Dec 22 2014

Status

approved