88679domain: NAppears in sequencesExpansion of E.g.f.: cos(cosh(x)*x) (even powers only).at n=5A009016Numbers k such that 30*R_k + 7 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=19A056680The Wiener index of the dendrimer NS[n], defined pictorially in the A. R. Ashrafi et al. reference.at n=2A224427