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)).

1, 2, 6, 2, 18, 12, 24, 24, 1320

Offset

1,2

Links

Table of n, a(n) for n=1..9.

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

Adjacent sequences: A284433 A284434 A284435 * A284437 A284438 A284439

Keyword

nonn,more

Author

Peter Kagey, Mar 27 2017

Status

approved