Engel expansion of 1/e = 0.367879... .

Terms

a(0) =3a(1) =10a(2) =28a(3) =54a(4) =88a(5) =130a(6) =180a(7) =238a(8) =304a(9) =378a(10) =460a(11) =550a(12) =648a(13) =754a(14) =868a(15) =990a(16) =1120a(17) =1258a(18) =1404a(19) =1558a(20) =1720a(21) =1890a(22) =2068a(23) =2254a(24) =2448a(25) =2650a(26) =2860a(27) =3078a(28) =3304a(29) =3538