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A252390 Number of (6+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 5 6 or 7 1
904, 764, 984, 1097, 1667, 2356, 2769, 4222, 5992, 7136, 10911, 15524, 18561, 28419, 40483, 48469, 74254, 105828, 126768, 194251, 276904, 331757, 508407, 724787, 868425, 1330878, 1897360, 2273440, 3484135, 4967196, 5951817, 9121435, 13004131 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A252384

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-3) -4*a(n-6) +a(n-9) for n>15

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A284744 A111042 A115496 * A218158 A249706 A098237

Adjacent sequences:  A252387 A252388 A252389 * A252391 A252392 A252393

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2014

STATUS

approved

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Last modified July 26 22:38 EDT 2017. Contains 289840 sequences.