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A252131 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 4 6 or 7 2
172, 156, 1535, 22766, 503968, 17562129, 937980660, 77093723594, 9818091214803, 1923038551366784, 579363831610999661, 269256446506102900668, 192945586040744107579685, 212997867807414690141275343 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A252139

LINKS

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

EXAMPLE

Some solutions for n=4

..3..3..3..3..3..2....3..3..3..3..3..2....3..3..3..3..3..3....3..2..3..3..3..3

..3..3..2..3..3..3....3..3..3..3..3..3....3..3..2..3..3..3....3..3..3..3..3..3

..2..3..3..3..3..3....3..3..3..3..2..3....3..3..3..3..3..3....2..3..3..3..3..3

..3..3..3..2..3..3....3..3..3..3..3..3....3..2..3..3..3..3....3..3..3..3..3..2

..3..2..3..3..3..2....3..3..3..3..3..3....3..3..3..3..3..2....3..3..3..3..3..3

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

CROSSREFS

Sequence in context: A259158 A252139 A252132 * A223823 A224555 A146339

Adjacent sequences:  A252128 A252129 A252130 * A252132 A252133 A252134

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 14 2014

STATUS

approved

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Last modified July 3 15:54 EDT 2022. Contains 355055 sequences. (Running on oeis4.)