Number of compositions of n into 4 ordered relatively prime parts.

Terms

a(0) =1a(1) =4a(2) =10a(3) =20a(4) =34a(5) =56a(6) =80a(7) =120a(8) =154a(9) =220a(10) =266a(11) =360a(12) =420a(13) =560a(14) =614a(15) =816a(16) =884a(17) =1120a(18) =1210a(19) =1540a(20) =1572a(21) =2020a(22) =2080a(23) =2544a(24) =2638a(25) =3276a(26) =3200a(27) =4060a(28) =4040a(29) =4840