A252007 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum 1 3 6 or 8 and every diagonal and antidiagonal sum not 1 3 6 or 8

756, 1602, 1434, 3814, 23074, 159514, 630978, 9398338, 147443266, 727410882, 26971790466, 1008740372610, 5759534502402, 540841653481602, 49879708292944002, 312661278003193602, 75268795781720633602

Offset

1,1

Comments

Diagonal of A252015

Links

Table of n, a(n) for n=1..17.

Example

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

Crossrefs

Sequence in context: A252008 A252015 A108374 * A202198 A158657 A004010

Adjacent sequences: A252004 A252005 A252006 * A252008 A252009 A252010

Keyword

nonn

Author

R. H. Hardin, Dec 12 2014

Status

approved