A252286 Number of (n+2)X(1+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 or 4.

564, 1130, 2525, 5910, 14042, 33171, 79607, 192757, 466820, 1139785, 2794089, 6859899, 16916803, 41819189, 103493568, 256675271, 637537134, 1584780098, 3943709283, 9822330752, 24476360165, 61027931196, 152237787148, 379887999122

Offset

1,1

Comments

Column 1 of A252293

Links

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

R. H. Hardin, Empirical recurrence of order 89

Formula

Empirical recurrence of order 89 (see link above)

Example

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

Crossrefs

Sequence in context: A014361 A274471 A252293 * A252285 A206131 A283782

Adjacent sequences: A252283 A252284 A252285 * A252287 A252288 A252289

Keyword

nonn

Author

R. H. Hardin, Dec 16 2014

Status

approved