The Padovan sequence A000931 doubled.

Terms

a(0) =2a(1) =0a(2) =0a(3) =2a(4) =0a(5) =2a(6) =2a(7) =2a(8) =4a(9) =4a(10) =6a(11) =8a(12) =10a(13) =14a(14) =18a(15) =24a(16) =32a(17) =42a(18) =56a(19) =74a(20) =98a(21) =130a(22) =172a(23) =228a(24) =302a(25) =400a(26) =530a(27) =702a(28) =930a(29) =1232