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A252024 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 2 or 4 0
213, 323, 2206, 29781, 672903, 23454804, 1251157837, 102663081633, 13029064255431, 2550191681514097, 768743005287335321, 357205125608485782595 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A252032

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=4

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

..2..2..2..1..2..2....2..1..2..2..2..2....1..2..2..2..2..1....2..2..2..2..2..1

..2..1..2..2..1..2....2..2..2..2..2..2....2..2..2..1..2..2....2..2..2..2..2..2

..2..2..2..2..2..1....2..2..2..2..2..2....2..2..2..2..2..2....2..2..2..2..1..2

..2..2..2..2..2..2....1..2..2..1..2..2....2..2..2..2..2..2....2..2..1..2..2..2

..2..1..2..2..1..2....2..1..2..2..2..2....2..2..2..2..2..2....2..2..2..2..2..2

CROSSREFS

Sequence in context: A238019 A251146 A085309 * A302256 A092127 A082967

Adjacent sequences:  A252021 A252022 A252023 * A252025 A252026 A252027

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 12 2014

STATUS

approved

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Last modified December 6 20:22 EST 2021. Contains 349567 sequences. (Running on oeis4.)