Convolution of L(n+1) := A000204(n+1) (Lucas), n>=0, with L(n+3), n>=0.

Terms

a(0) =4a(1) =19a(2) =48a(3) =107a(4) =220a(5) =432a(6) =822a(7) =1529a(8) =2796a(9) =5045a(10) =9006a(11) =15936a(12) =27992a(13) =48863a(14) =84840a(15) =146623a(16) =252368a(17) =432816a(18) =739914a(19) =1261285a(20) =2144484a(21) =3637609a(22) =6157218a(23) =10401792a(24) =17541100a(25) =29531947a(26) =49644192a(27) =83336339