262178domain: NAppears in sequencesA067076 + A000079/2.at n=19A092176Number of partitions of the graph G_n (defined below) into "strokes".at n=17A131520a(n) = Sum_{d|n} d*2^(d^2).at n=3A171732a(n) = Sum_{d|n} phi(d)^(d+1).at n=7A342485