Smallest j with n nodes in its riff (rooted index-functional forest).

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =10a(5) =15a(6) =30a(7) =55a(8) =105a(9) =165a(10) =330a(11) =660a(12) =1155a(13) =2145a(14) =4290a(15) =7755a(16) =15015a(17) =30030a(18) =54285a(19) =100815a(20) =201630a(21) =403260a(22) =705705a(23) =1411410a(24) =2822820a(25) =5645640a(26) =11392095a(27) =20465445a(28) =40930890a(29) =79744665