Number of relatively prime p-trees of weight n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =22a(6) =74a(7) =174a(8) =530a(9) =1302a(10) =4713a(11) =10639a(12) =40877a(13) =101795a(14) =325609a(15) =925733a(16) =3432819a(17) =8078511a(18) =32542036a(19) =82226383a(20) =279096823a(21) =795532677a(22) =3066505569a(23) =7374764180a(24) =28946183035a(25) =79313174765a(26) =275507514909a(27) =772692247626