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A252311 Number of (6+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 1 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 1 3 6 or 7 1
3681, 3476, 5416, 7489, 14515, 24076, 34279, 70643, 120328, 173799, 386803, 679072, 998407, 2392371, 4310288, 6431079, 16347187, 30013936, 45246631, 119642163, 222278576, 337209639, 912658483, 1706977072, 2598711847, 7123476531 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A252305

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 15*a(n-3) -70*a(n-6) +120*a(n-9) -64*a(n-12) for n>21

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A103608 A204757 A250875 * A263814 A179130 A234486

Adjacent sequences:  A252308 A252309 A252310 * A252312 A252313 A252314

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 16 2014

STATUS

approved

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Last modified October 19 13:01 EDT 2019. Contains 328222 sequences. (Running on oeis4.)