Maybe it's a form of base-62 encoding like this:
new encoding: 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z
decimal: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61
Tried that a day ago.
61 6 9 19 35 52 47 19 49 8 6 2 13 1 49 39 59 7 50 21 31 14 22 48 31 24 47 25 1 61 40 58 14 40 30 12 53 54 18 7 27 50 36 43 61 51 40 49 60 7 25