Engel expansion of sinh(1/3).

Terms

a(0) =3a(1) =54a(2) =180a(3) =378a(4) =648a(5) =990a(6) =1404a(7) =1890a(8) =2448a(9) =3078a(10) =3780a(11) =4554a(12) =5400a(13) =6318a(14) =7308a(15) =8370a(16) =9504a(17) =10710a(18) =11988a(19) =13338a(20) =14760a(21) =16254a(22) =17820a(23) =19458a(24) =21168a(25) =22950a(26) =24804a(27) =26730a(28) =28728a(29) =30798