Number of partitions of n into parts with at most one part not greater than 2.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =4a(6) =5a(7) =7a(8) =9a(9) =12a(10) =15a(11) =20a(12) =25a(13) =32a(14) =40a(15) =51a(16) =63a(17) =79a(18) =97a(19) =121a(20) =148a(21) =182a(22) =221a(23) =271a(24) =328a(25) =398a(26) =479a(27) =579a(28) =694a(29) =834