A252449 - OEIS

A252449

Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 2 4 6 or 7

661, 334, 3366, 48170, 1058050, 36760486, 1956458824, 160517960252, 20418505768994, 3997026837680912, 1204054337705584421, 559547936390811196991

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Diagonal of A252457

LINKS

EXAMPLE

Some solutions for n=4

..1..1..1..1..1..1....3..3..2..3..3..3....3..3..3..3..3..3....1..1..1..1..1..3

..3..1..1..3..1..1....2..3..3..3..3..3....3..3..3..3..3..2....1..1..1..1..1..1

..1..1..1..1..1..1....3..3..3..3..3..3....3..2..3..3..3..3....1..1..1..1..3..1

..1..1..1..1..1..1....3..3..3..3..3..2....3..3..3..3..3..3....1..1..1..1..1..1

..1..1..1..1..3..1....2..3..3..3..3..3....3..3..3..3..3..3....3..1..1..1..1..1

..1..1..3..1..1..1....3..3..2..3..3..3....3..3..3..2..3..3....1..3..1..1..3..1

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2014

STATUS

approved