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A252080 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 or 4 0
64, 322, 3326, 47266, 1034546, 35987921, 1915241208, 157183478333, 19993599538566, 3912790092731608, 1178650827932347077, 547811008058997697527, 392513656335386815116037 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A252088

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=4

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

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

..0..0..0..0..2..0....2..2..2..2..2..2....0..0..2..0..0..0....0..0..0..0..0..0

..0..0..0..0..0..0....2..2..2..2..2..2....0..2..0..0..0..0....2..0..0..0..2..0

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

..0..0..0..0..0..2....2..2..2..2..2..2....0..0..0..0..2..0....0..0..0..0..0..0

CROSSREFS

Sequence in context: A231942 A221686 A211258 * A017366 A186441 A297642

Adjacent sequences:  A252077 A252078 A252079 * A252081 A252082 A252083

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 13 2014

STATUS

approved

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Last modified November 27 18:22 EST 2020. Contains 338683 sequences. (Running on oeis4.)