Convolved with its aerated variant = A000041.

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) =19a(12) =25a(13) =31a(14) =38a(15) =48a(16) =60a(17) =73a(18) =89a(19) =109a(20) =133a(21) =161a(22) =193a(23) =232a(24) =279a(25) =333a(26) =395a(27) =470a(28) =558a(29) =658