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A284432 The number of positive integer sequences of length n with no duplicate substrings (forward or backward) and a minimal sum (i.e., the sum of the sequence is A282168(n)). 0
1, 1, 2, 2, 4, 4, 4, 48, 48, 144 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

For n = 7 the a(7) = 4 solutions are:

[1,3,3,2,2,1,1],

[1,2,2,3,3,1,1],

[1,1,3,3,2,2,1], and

[1,1,2,2,3,3,1].

CROSSREFS

Cf. A282168.

Sequence in context: A083548 A082849 A211882 * A284435 A156130 A123756

Adjacent sequences:  A284429 A284430 A284431 * A284433 A284434 A284435

KEYWORD

nonn,more

AUTHOR

Peter Kagey, Mar 27 2017

STATUS

approved

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Last modified August 11 03:41 EDT 2022. Contains 356046 sequences. (Running on oeis4.)