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A284436
The number of positive integer sequences of length n with no duplicate substrings (forward or backward), every number different from its neighbors, and a minimal product (i.e., the product of the sequence is A282167(n)).
0
1, 2, 6, 2, 18, 12, 24, 24, 1320
OFFSET
1,2
EXAMPLE
For n = 4 the a(4) = 2 solutions are [1,3,2,1] and [1,2,3,1].
CROSSREFS
Cf. A282167.
Sequence in context: A236697 A235797 A284433 * A322312 A174857 A248568
KEYWORD
nonn,more
AUTHOR
Peter Kagey, Mar 27 2017
STATUS
approved