Convolution of L(n+1) := A000204(n+1) (Lucas), n>=0, with L(n+2), n>=0.

Terms

a(0) =3a(1) =13a(2) =31a(3) =69a(4) =140a(5) =274a(6) =519a(7) =963a(8) =1757a(9) =3165a(10) =5642a(11) =9972a(12) =17499a(13) =30521a(14) =52955a(15) =91461a(16) =157336a(17) =269702a(18) =460863a(19) =785295a(20) =1334713a(21) =2263293a(22) =3829846a(23) =6468264a(24) =10905075a(25) =18355429a(26) =30849559a(27) =51776133a(28) =86785892