66936

Appears in sequences

• a(n) counts the distinct cubical (on alphabet of 3 symbols) billiard words with length n, acting as prefix to just k = 1 such word of length n+1 (that is, not "special").at n=17A180437
• Binary XOR of (3^k - 1)/2 as k varies from 1 to n.at n=10A199396
• Number of 6-cycles in the n X n knight graph.at n=25A289181
• a(n) = Sum_{k<n} ((2^n-1) mod (2^k-1)).at n=31A329162