a(n) = 5*a(n-1) + A047201(n), a(1) = 1. A047201 = numbers not divisible by 5: (1, 2, 3, 4, 6, 7, 8, 9, 11, ...).

A141845

a(n) = 5*a(n-1) + A047201(n), a(1) = 1. A047201 = numbers not divisible by 5: (1, 2, 3, 4, 6, 7, 8, 9, 11, ...).

Terms

    a(0) =1a(1) =7a(2) =38a(3) =194a(4) =976a(5) =4887a(6) =24443a(7) =122224a(8) =611131a(9) =3055667a(10) =15278348a(11) =76391754a(12) =381958786a(13) =1909793947a(14) =9548969753a(15) =47744848784a(16) =238724243941

External references