a(n) = floor(1/(n-1) * Sum_{k=1..n-1} a(k)^(n/k)), given a(0)=1, a(1)=3, a(2)=7.

Terms

a(0) =1a(1) =3a(2) =7a(3) =22a(4) =63a(5) =180a(6) =512a(7) =1457a(8) =4144a(9) =11791a(10) =33564a(11) =95580a(12) =272280a(13) =775922a(14) =2211891a(15) =6307338a(16) =17991183a(17) =51333407a(18) =146508751a(19) =418260894a(20) =1194397553a(21) =3411667838a(22) =9747639585a(23) =27857756981a(24) =79635405673a(25) =227708537573a(26) =651276560978