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URL: https://oeis.org/A214168

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A214168
Number of 0..5 colorings of a 2 X (n+1) array circular in the n+1 direction with new values 0..5 introduced in row major order.
1
4, 18, 337, 5994, 121778, 2518082, 52655411, 1103993538, 23172461572, 486537381066, 10216717221605, 214546979103002, 4505458523356886, 94614430060611570, 1986901652087170519, 41724924973226947986
OFFSET
1,1
COMMENTS
Row 2 of A214166.
LINKS
FORMULA
Empirical: a(n) = 21*a(n-1) +49*a(n-2) -959*a(n-3) -1869*a(n-4) +7679*a(n-5) +15051*a(n-6) -6741*a(n-7) -13230*a(n-8).
EXAMPLE
Some solutions for n=4
..0..1..0..2..1....0..1..0..2..1....0..1..0..1..2....0..1..0..1..2
..1..2..1..0..2....2..3..1..4..5....1..0..1..0..3....2..3..1..0..3
CROSSREFS
Cf. A214166.
Sequence in context: A278565 A370189 A360283 * A214189 A214240 A156522
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 05 2012
STATUS
approved