OFFSET
1,2
COMMENTS
Equivalence is up to permutation of the colors.
EXAMPLE
a(1) = 1: 1.
a(2) = 2: (11), (12).
a(3) = 5: (111), (112), (1(11)), (1(12)), (1(22)).
PROG
(PARI) \\ See A339645 for cycleIndexSeries and InequivalentColoringsSeq.
InequivalentColoringsSeq(cycleIndexSeries(20), 2)
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Dec 16 2020
STATUS
approved