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A282193 a(n) is the minimal product of a positive integer sequence of length n with no duplicate substrings (forward or backward) of length greater than 1. 2
1, 1, 2, 4, 6, 12, 36, 96, 240, 480, 1440, 5760 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..12.

Peter Kagey, Haskell program for A282193.

EXAMPLE

a(1)  = 1    via [1];

a(2)  = 1    via [1,1];

a(3)  = 2    via [1,1,2];

a(4)  = 4    via [1,1,2,2];

a(5)  = 6    via [1,1,2,3,1];

a(6)  = 12   via [1,1,2,2,3,1];

a(7)  = 36   via [1,1,2,2,3,3,1];

a(8)  = 96   via [1,1,2,2,3,1,4,2];

a(9)  = 240  via [1,1,2,2,3,1,4,5,1];

a(10) = 480  via [1,1,2,2,3,1,4,2,5,1];

a(11) = 1440 via [1,1,2,2,3,3,1,4,2,5,1];

a(12) = 5760 via [1,1,2,2,3,1,4,2,5,1,6,2].

...

[1,2,3,1,2] is invalid because the substring [1,2] appears twice.

[1,2,1] is invalid because because the substring [1,2] appears twice (once forward and once backward).

CROSSREFS

Cf. A282168 is the sum analog.

Cf. A282164, A282169, A282170.

Sequence in context: A220423 A283021 A087902 * A180213 A081457 A261206

Adjacent sequences:  A282190 A282191 A282192 * A282194 A282195 A282196

KEYWORD

nonn,more

AUTHOR

Peter Kagey, Feb 08 2017

STATUS

approved

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Last modified November 13 19:25 EST 2018. Contains 317149 sequences. (Running on oeis4.)