Convolved with its aerated variant of two zeros between terms = A000041.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =5a(6) =7a(7) =9a(8) =13a(9) =17a(10) =23a(11) =29a(12) =38a(13) =48a(14) =62a(15) =77a(16) =98a(17) =121a(18) =153a(19) =187a(20) =233a(21) =283a(22) =349a(23) =422a(24) =515a(25) =620a(26) =751a(27) =900a(28) =1083a(29) =1291