A253017 Number of (n+2)X(n+2) 0..3 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

25, 50, 133, 155, 327, 864, 920, 1832, 4672, 4880, 9424, 23552, 24320, 46080, 113664, 116480, 217856, 532480, 542720, 1005568, 2441216, 2478080, 4558848, 11010048, 11141120, 20381696, 49020928, 49479680

Offset

1,1

Comments

Diagonal of A253025

Links

Table of n, a(n) for n=1..28.

Example

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

Crossrefs

Sequence in context: A232438 A360017 A034025 * A042236 A042238 A042234

Adjacent sequences: A253014 A253015 A253016 * A253018 A253019 A253020

Keyword

nonn

Author

R. H. Hardin, Dec 26 2014

Status

approved