38471domain: NAppears in sequencesNumber of set partitions of [n] into subsets whose element sums are squares.at n=16A281994Let L_1 = (1) and L_2 = (1, 2); for any n > 2, L_n is obtained by inserting one n between each pair of consecutive terms of L_{n-1} coprime to n; a(n) gives the number of terms in L_n.at n=22A370858