Engel expansion of exp(2).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =6a(9) =333a(10) =444a(11) =476a(12) =735a(13) =1227a(14) =1740a(15) =16541a(16) =19348a(17) =45751a(18) =49117a(19) =139069a(20) =567376a(21) =1438204a(22) =23992692a(23) =36889249a(24) =69357744a(25) =206213866a(26) =487816917a(27) =23325191834a(28) =82451809814a(29) =378427041146