Self-convolution of Lucas numbers.

Terms

a(0) =1a(1) =6a(2) =17a(3) =38a(4) =80a(5) =158a(6) =303a(7) =566a(8) =1039a(9) =1880a(10) =3364a(11) =5964a(12) =10493a(13) =18342a(14) =31885a(15) =55162a(16) =95032a(17) =163114a(18) =279051a(19) =475990a(20) =809771a(21) =1374316a(22) =2327372a(23) =3933528a(24) =6636025a(25) =11176518a(26) =18794633a(27) =31560206a(28) =52925984a(29) =88646390