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A246897 Number of length 5+4 0..n arrays with some pair in every consecutive five terms totalling exactly n 1
416, 16621, 173056, 1216081, 4971120, 17677453, 47799488, 120392449, 259777600, 536775181, 1005318336, 1828277521, 3107102096, 5168689261, 8183025280, 12745702273, 19117702368, 28308317869, 40691100800, 57882676561, 80386887856 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 5 of A246892
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +5*a(n-2) -12*a(n-3) -9*a(n-4) +30*a(n-5) +5*a(n-6) -40*a(n-7) +5*a(n-8) +30*a(n-9) -9*a(n-10) -12*a(n-11) +5*a(n-12) +2*a(n-13) -a(n-14)
EXAMPLE
Some solutions for n=3
..3....2....0....3....2....0....0....1....2....0....0....0....0....0....2....0
..2....2....0....2....1....3....3....0....0....3....0....0....2....1....3....3
..2....2....1....0....2....2....1....2....0....2....0....3....1....2....0....0
..2....1....2....0....1....1....0....0....1....2....2....0....2....2....1....1
..1....0....3....3....0....0....1....1....1....0....3....3....0....2....1....2
..0....1....2....2....1....0....2....2....3....1....3....3....0....3....3....1
..2....3....3....3....3....3....1....2....2....1....0....1....0....1....0....2
..2....0....0....1....1....1....1....1....0....3....3....0....3....3....0....0
..1....0....1....1....0....0....0....3....3....1....1....0....3....0....2....2
CROSSREFS
Sequence in context: A224602 A249006 A249471 * A223422 A239191 A324613
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 06 2014
STATUS
approved

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Last modified June 15 16:36 EDT 2024. Contains 373410 sequences. (Running on oeis4.)