How many paths can you find that spell “MISERABLE”?

There are 511 paths to MISERABLE. If there are n letters in a word, then there are 2n – 1 paths to that word in a similar set-up. Proof, anyone?

There are 511 paths to MISERABLE. If there are n letters in a word, then there are 2n – 1 paths to that word in a similar set-up. Proof, anyone?