Number of 2's in all partitions of n.

Terms

a(0) =0a(1) =1a(2) =1a(3) =3a(4) =4a(5) =8a(6) =11a(7) =19a(8) =26a(9) =41a(10) =56a(11) =83a(12) =112a(13) =160a(14) =213a(15) =295a(16) =389a(17) =526a(18) =686a(19) =911a(20) =1176a(21) =1538a(22) =1968a(23) =2540a(24) =3223a(25) =4115a(26) =5181a(27) =6551a(28) =8191a(29) =10269