Number of rooted 2-regular labeled graphs on n nodes.
A211774
Number of rooted 2-regular labeled graphs on n nodes.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =3a(4) =12a(5) =60a(6) =420a(7) =3255a(8) =28056a(9) =270144a(10) =2868840a(11) =33293205a(12) =419329020a(13) =5697423732a(14) =83069039508
External references
- oeis: A211774