The Lost Lion Tail of Little John
CORRECT!
For those who couldn't figure it out, let's look at it this way:
Blackbeard's Treasure Map -
Episode #1Wild Bill Hickok and the Dead Man's Hand -
Episode #4The Star of Sultan Saladin -
Episode #9Henry VIII's Great Seal -
Episode #16The Stone Marker of Lief Eriksson -
Episode #25Robin Hood and Marian's Silk Ladder -
Episode #36The Mush Pot Hat of Johnny Appleseed -
Episode #49The pattern is perfect square numbers, therefore the next one is:
The Lost Lion Tail of Little John -
Episode #64