66579

Appears in sequences

• Half the number of 4 X n binary arrays with a path of adjacent 1's and a path of adjacent 0's from top row to bottom row.at n=3A069397
• Half the number of n X 5 binary arrays with a path of adjacent 1's and a path of adjacent 0's from top row to bottom row.at n=3A069405
• The number of permutations of length n in a particular geometric grid class.at n=10A226431