OFFSET
0,4
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..25
Eric Weisstein's World of Mathematics, Graph Bridge
Eric Weisstein's World of Mathematics, Endpoint
PROG
bridgelessGraphs(n)={my(gc=sLog(graphsSeries(n)), gcr=sPoint(gc)); sSolve( gc + gcr^2/2 - sRaise(gcr, 2)/2, x*sv(1)*sExp(gcr) )}
cycleIndexSeries(n)={1+sSubstOp(bridgelessGraphs(n), symGroupSeries(n))}
NumUnlabeledObjsSeq(cycleIndexSeries(15)) \\ Andrew Howroyd, Dec 31 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Dec 06 2018
EXTENSIONS
a(6)-a(10) from Andrew Howroyd, Dec 08 2018
Terms a(11) and beyond from Andrew Howroyd, Dec 31 2020
STATUS
approved