Sum of Lucas numbers and reflected Lucas numbers (comment to A061084).

Terms

a(0) =4a(1) =0a(2) =6a(3) =0a(4) =14a(5) =0a(6) =36a(7) =0a(8) =94a(9) =0a(10) =246a(11) =0a(12) =644a(13) =0a(14) =1686a(15) =0a(16) =4414a(17) =0a(18) =11556a(19) =0a(20) =30254a(21) =0a(22) =79206a(23) =0a(24) =207364a(25) =0a(26) =542886a(27) =0a(28) =1421294a(29) =0