Number of rooted twice-partitions of n where the composite rooted partition is constant.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =7a(5) =11a(6) =17a(7) =24a(8) =34a(9) =46a(10) =63a(11) =82a(12) =109a(13) =140a(14) =183a(15) =233a(16) =298a(17) =376a(18) =479a(19) =598a(20) =753a(21) =938a(22) =1171a(23) =1449a(24) =1797a(25) =2210a(26) =2726a(27) =3342a(28) =4095a(29) =4990