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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 16 2014
STATUS
approved

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Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)