1,2

R. C. Read, Graphical enumeration by cycle-index sums: first steps toward a unified treatment, preprint, Sept. 26, 1991.

Reference gives generating functions.

A048172=A048173+A048174.

Sequence in context: A080893 A028854 A108292 this_sequence A053554 A079145 A000763

Adjacent sequences: A048169 A048170 A048171 this_sequence A048173 A048174 A048175

nonn,easy,nice,more

njas