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A252303 Number of (n+2)X(6+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
7138, 5056, 6103, 8130, 15444, 24076, 33862, 71636, 117612, 167798, 385332, 662964, 951766, 2359892, 4219348, 6078806, 16019028, 29452116, 42525526, 116755796, 218457940, 315839318, 888530772, 1679113044, 2429346646, 6926306132 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A260051 A123292 A116180 * A273752 A213097 A063058

Adjacent sequences:  A252300 A252301 A252302 * A252304 A252305 A252306

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 16 2014

STATUS

approved

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Last modified May 25 02:26 EDT 2022. Contains 354047 sequences. (Running on oeis4.)