A252623 Number of (n+2)X(1+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 1 3 6 or 8

4508, 17704, 81098, 405044, 2130874, 11518022, 63438930, 353233466, 1976523666, 11088640448, 62315269254, 350508927020, 1972366177122, 11101445268642, 62493475929562, 351821536293274, 1980734034606622, 11151649389273578

Offset

1,1

Comments

Column 1 of A252628

Links

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

Example

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

Crossrefs

Sequence in context: A144490 A252470 A252628 * A023684 A105845 A107543

Adjacent sequences: A252620 A252621 A252622 * A252624 A252625 A252626

Keyword

nonn

Author

R. H. Hardin, Dec 19 2014

Status

approved