

A026606


[1>null]transform of threesymbol ThueMorse A026600, with 1 subtracted.


0



1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2
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OFFSET

1,2


COMMENTS

Old name was: a(n) = b(n)1, where b(n) = nth term of A026600 that is not a 1.
From Michel Dekking, Apr 18 2019: (Start)
This sequence is a morphic sequence, i.e., a lettertoletter projection of a fixed point of a morphism. Let the morphism sigma be given by
1>123, 2>456, 3>345,4>612, 5>561, 6>234,
and let the lettertoletter map delta be given by
1>1, 2>2, 3>1, 4>2, 5>2, 6>1.
Then (a(n)) = delta(x), where x = 1234... is a fixed point of sigma.
This representation can be obtained by noting that this sequence, with 1 added, can also be viewed as the [1>23, 2>23, 3>32]transform of A026600, and by doubling 1,2 and 3, renaming the resulting six letters as 1,2,3,4,5,6.
(End)


LINKS

Table of n, a(n) for n=1..90.


CROSSREFS

Cf. A026605, A057215.
Sequence in context: A144083 A332292 A054350 * A265918 A207676 A161175
Adjacent sequences: A026603 A026604 A026605 * A026607 A026608 A026609


KEYWORD

nonn


AUTHOR

Clark Kimberling


EXTENSIONS

Name changed by Michel Dekking, Apr 18 2019


STATUS

approved



