Hoggatt sequence with parameter d=5.

Terms

a(0) =1a(1) =2a(2) =8a(3) =44a(4) =310a(5) =2606a(6) =25202a(7) =272582a(8) =3233738a(9) =41454272a(10) =567709144a(11) =8230728508a(12) =125413517530