14676024

Appears in sequences

• a(n) = 4^n - C(4,3)*3^n + C(4,2)*2^n - C(4,1).at n=11A000919
• Palindromes using exactly four different symbols.at n=22A056455
• Palindromes using exactly four different symbols.at n=23A056455
• Number of primitive (aperiodic) palindromes using exactly four different symbols.at n=22A056465
• Number of periodic palindromes using exactly four different symbols.at n=22A056490
• Number of primitive (period n) periodic palindromes using exactly four different symbols.at n=22A056500
• Triangle read by rows: T(n,k) = Sum_{j=0..2k} (-1)^j * binomial(2k,j) * (2+k-j)^(2n).at n=23A390029