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A252425 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 4 6 or 7 0
641, 688, 1810, 7575, 85563, 1190037, 10924203, 384953455, 14875741975, 235391624751, 26396547463733, 2950331202467754, 75986516939085808, 27838867253853706000, 9086935218480182872031 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A252433

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=4

..3..0..1..3..0..1....3..2..2..3..2..2....3..0..1..3..3..1....3..2..2..0..2..2

..3..2..2..3..2..2....2..3..2..2..0..2....0..2..2..3..2..2....2..3..2..2..3..2

..2..3..2..2..3..2....3..3..1..3..3..1....2..3..2..2..0..2....3..3..1..3..3..1

..0..3..1..3..3..1....3..2..2..3..2..2....3..3..1..3..3..1....0..2..2..3..2..2

..3..2..2..0..2..2....2..3..2..2..0..2....3..2..2..3..2..2....2..3..2..2..3..2

..2..0..2..2..3..2....0..3..1..3..3..1....2..3..2..2..3..2....3..0..1..3..0..1

CROSSREFS

Sequence in context: A268875 A252426 A256777 * A160203 A251840 A252433

Adjacent sequences:  A252422 A252423 A252424 * A252426 A252427 A252428

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2014

STATUS

approved

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Last modified January 17 09:45 EST 2018. Contains 297815 sequences.