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A252220 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock row and column sum 2 3 or 4 and every diagonal and antidiagonal sum not 2 3 or 4 1
228, 1028, 9566, 58334, 412514, 4329476, 44099648, 415405634, 3886445124, 36834748542, 350195757374, 3322757907650, 31500492289092, 298706072056064, 2833049748399426, 26869277927218244, 254824501845465374 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A252228

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..34

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A258557 A206005 A228963 * A263301 A053174 A335270

Adjacent sequences:  A252217 A252218 A252219 * A252221 A252222 A252223

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 15 2014

STATUS

approved

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Last modified October 16 20:36 EDT 2021. Contains 348047 sequences. (Running on oeis4.)