A008585+A029907.

Terms

a(0) =0a(1) =4a(2) =8a(3) =13a(4) =20a(5) =30a(6) =46a(7) =72a(8) =116a(9) =191a(10) =320a(11) =542a(12) =924a(13) =1580a(14) =2704a(15) =4625a(16) =7900a(17) =13470a(18) =22922a(19) =38928a(20) =65980a(21) =111619a(22) =188488a(23) =317758a(24) =534840a(25) =898900a(26) =1508696a(27) =2528917a(28) =4233956a(29) =7080606