a(n) = b(n) + d(n), where b(n) = (n-th Lucas number > 1) and d(n) = (n-th number that is 1, 2, or 3, or is not a Lucas number).

A023501

a(n) = b(n) + d(n), where b(n) = (n-th Lucas number > 1) and d(n) = (n-th number that is 1, 2, or 3, or is not a Lucas number).

Terms

    a(0) =4a(1) =6a(2) =10a(3) =16a(4) =24a(5) =37a(6) =56a(7) =86a(8) =135a(9) =212a(10) =336a(11) =536a(12) =859a(13) =1381a(14) =2226a(15) =3591a(16) =5799a(17) =9371a(18) =15150a(19) =24500a(20) =39628a(21) =64105a(22) =103709a(23) =167789a(24) =271473a(25) =439235a(26) =710679a(27) =1149884a(28) =1860532a(29) =3010384

External references