69955domain: NAppears in sequencesNumber of crossings in a regular drawing of the complete bipartite graph K(n,n).at n=27A159065Least positive integer k such that prime(k*n)+2 = prime(i*n)*prime(j*n) for some 0 < i < j.at n=40A257926Expansion of (1/x) * Series_Reversion( x / (1/(1-x)^2 + x) ).at n=7A369616