a(n+1) = floor( (a(n) + 1)^(1 + 1/n) ), with a(1) = 1.

Terms

a(0) =1a(1) =4a(2) =11a(3) =27a(4) =64a(5) =149a(6) =345a(7) =797a(8) =1839a(9) =4242a(10) =9782a(11) =22554a(12) =52001a(13) =119892a(14) =276417a(15) =637290a(16) =1469294a(17) =3387506a(18) =7810005a(19) =18006217a(20) =41513909a(21) =95711641a(22) =220666238a(23) =508753041a(24) =1172946341a(25) =2704265147a(26) =6234769423a(27) =14374459471a(28) =33140774109