A252671 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 5 6 or 7

656, 630, 2106, 7747, 96174, 1404868, 10457376, 432468082, 18264393655, 223008908330, 30759205997253, 3752044589478219, 71270194170511699, 33527998766173019766, 11865743162374482670070, 340835456009112200117336

Offset

1,1

Comments

Diagonal of A252679

Links

Table of n, a(n) for n=1..16.

Example

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

Crossrefs

Sequence in context: A280445 A220057 A194653 * A252672 A252679 A252680

Adjacent sequences: A252668 A252669 A252670 * A252672 A252673 A252674

Keyword

nonn

Author

R. H. Hardin, Dec 20 2014

Status

approved