Number of 2's in all partitions of 2n that do not contain 1 as a part.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =8a(5) =15a(6) =27a(7) =48a(8) =82a(9) =137a(10) =225a(11) =362a(12) =572a(13) =892a(14) =1370a(15) =2078a(16) =3117a(17) =4624a(18) =6791a(19) =9885a(20) =14263a(21) =20416a(22) =29007a(23) =40921a(24) =57345a(25) =79864a(26) =110565a(27) =152211a(28) =208435a(29) =283982