A generalized Engel expansion of 1/Pi.

Terms

a(0) =4a(1) =3a(2) =6a(3) =12a(4) =51a(5) =146a(6) =280a(7) =482a(8) =687a(9) =3825a(10) =5646a(11) =30904a(12) =120121a(13) =1344923a(14) =2340376a(15) =4456271a(16) =194324055a(17) =219784933a(18) =976224357a(19) =11584437417a(20) =26402463827a(21) =34635051144a(22) =85031207055a(23) =95014277980a(24) =257962314442