Number of 4's in all partitions of n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =2a(6) =3a(7) =6a(8) =8a(9) =13a(10) =18a(11) =28a(12) =38a(13) =55a(14) =74a(15) =105a(16) =139a(17) =190a(18) =250a(19) =336a(20) =436a(21) =575a(22) =740a(23) =963a(24) =1228a(25) =1577a(26) =1995a(27) =2538a(28) =3186a(29) =4013