Numerator of the cumulative frequency of the dropping time in the Collatz iteration.

Terms

a(0) =1a(1) =3a(2) =13a(3) =7a(4) =115a(5) =237a(6) =15a(7) =1935a(8) =7825a(9) =31473a(10) =31711a(11) =254649a(12) =15957a(13) =2050541a(14) =8219801a(15) =16490635a(16) =33035745a(17) =132455435a(18) =530485275a(19) =1061920785a(20) =4253619813a(21) =4256987887a(22) =34095896991a(23) =136471574881a(24) =273072139013a(25) =136638599097