a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^3, where Lucas(n) = A000204(n).

A203854

a(n) = (1/n) * Sum_{d|n} moebius(n/d) * Lucas(d)^3, where Lucas(n) = A000204(n).

Terms

    a(0) =1a(1) =13a(2) =21a(3) =79a(4) =266a(5) =957a(6) =3484a(7) =12935a(8) =48768a(9) =185951a(10) =716418a(11) =2781675a(12) =10878520a(13) =42789478a(14) =169181010a(15) =671866245a(16) =2678678730a(17) =10716651456a(18) =43007270292a(19) =173072549610a(20) =698235680844

External references