A252465 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 8

570, 682, 1741, 22832, 504030, 17562191, 937980722, 77093723656, 9818091214865, 1923038551366846, 579363831610999723, 269256446506102900730, 192945586040744107579747, 212997867807414690141275405

Offset

1,1

Comments

Diagonal of A252473

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Sequence in context: A263708 A219992 A221218 * A252473 A252466 A097035

Adjacent sequences: A252462 A252463 A252464 * A252466 A252467 A252468

Keyword

nonn

Author

R. H. Hardin, Dec 17 2014

Status

approved