A generalized Engel expansion of 1/Pi.

Terms

a(0) =3a(1) =23a(2) =27a(3) =89a(4) =137a(5) =9190a(6) =25731a(7) =80457a(8) =125859a(9) =270815a(10) =609977a(11) =959612a(12) =1034186a(13) =1491489a(14) =2975032a(15) =264484387a(16) =1092196976a(17) =1194228023a(18) =1424193547a(19) =4523998315a(20) =13583506006a(21) =380693793416