16664094960
domain: N
Appears in sequences
- a(n) = 4^n - C(4,3)*3^n + C(4,2)*2^n - C(4,1).at n=16A000919
- Number of primitive (aperiodic) words of length n which contain exactly four different symbols.at n=16A056269
- Palindromes using exactly four different symbols.at n=32A056455
- Palindromes using exactly four different symbols.at n=33A056455
- Number of periodic palindromes using exactly four different symbols.at n=32A056490