OFFSET
0,2
COMMENTS
A partition multicycle graph consists of a multiset of cycles with lengths given by the elements of the partition where degenerate cycles on one node are taken to be singletons and on two nodes a pair of nodes connected by an edge. The ordering of the partitions is by traversing antichains in Young's lattice bottom to top, left to right. Isomorphism refers to the automorphisms of the multicycle graph corresponding to the partition, consisting of permutations of cycles of the same length combined with rotations of individual cycles (no dihedral symmetry).
LINKS
Marko Riedel et al., Orbital chromatic polynomials
FORMULA
For a partition lambda we have the OCP: Product_{p^v in lambda} C(Q_p(k)+v-1, v)
where Q_1(k) = k, Q_2(k) = k(k-1)/2 and for n>=3, Q_n(k) = (1/n) * Sum_{d|n} phi(n/d) P_d(k) with P_d(k) = (k-1)^d + (-1)^d (k-1). Here we have k=4.
EXAMPLE
Rows are:
1;
4;
10, 6;
20, 24, 8;
35, 60, 21, 32, 24;
56, 120, 84, 80, 48, 96, 48;
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Marko Riedel, Jan 15 2018
STATUS
approved