Stopping times.

Terms

a(0) =2a(1) =6a(2) =11a(3) =26a(4) =51a(5) =106a(6) =111a(7) =113a(8) =261a(9) =286a(10) =1506a(11) =12666a(12) =15751a(13) =45356a(14) =76501