Convolution of natural numbers >= 2 and Lucas numbers.

Terms

a(0) =2a(1) =9a(2) =21a(3) =43a(4) =80a(5) =142a(6) =244a(7) =411a(8) =683a(9) =1125a(10) =1842a(11) =3004a(12) =4886a(13) =7933a(14) =12865a(15) =20847a(16) =33764a(17) =54666a(18) =88488a(19) =143215a(20) =231767a(21) =375049a(22) =606886a(23) =982008a(24) =1588970a(25) =2571057a(26) =4160109a(27) =6731251a(28) =10891448a(29) =17622790