242126domain: NAppears in sequencesNumber of isolated-pentagon fullerenes with 2n vertices (or carbon atoms).at n=40A086423Expansion of g.f. A(x) satisfying A(x) = 1 + x*(A(x)^2 - A(-x)^2)/2 + x*sqrt( (A(x)^4 + A(-x)^4)/2 ).at n=11A368593