787320

Appears in sequences

• Number of bracelets with n labeled beads of 3 colors.at n=7A032261
• One ninth of 9-factorial numbers.at n=4A035023
• Number of n X n matrices over GF(3) with characteristic polynomial x^(n-1) * (x-1).at n=3A088671
• Sum of the lengths of the drops in all ternary words of length n on {0,1,2}. The drops of a ternary word on {0,1,2} are the subwords 10,20 and 21, their lengths being the differences 1, 2 and 1, respectively.at n=10A120908
• (n-1)-st elementary symmetric function of the first n terms of A010684.at n=19A203230
• (n-1)-st elementary symmetric function of the first n terms of the periodic sequence (3,1,3,1,3,1,3,1,...).at n=19A203231
• Number of 0..n arrays of length 7 with each element unequal to at least one neighbor, starting with 0.at n=8A221466
• Numbers such that (sum + product) of all their prime factors equals (sum + product) of all exponents in their prime factorization.at n=38A272818
• Coefficients in q-expansion of (6*E_2^2*E_4 - 8*E_2*E_6 + 3*E_4^2 - E_2^4)/6912, where E_2, E_4, E_6 are the Eisenstein series shown in A006352, A004009, A013973, respectively.at n=27A282211
• Number of n-colorings of the Goldner-Harary graph.at n=6A362712
• Irregular triangular array T; row n shows the coefficients of the (n-1)-st polynomial in the obverse convolution s(x)**t(x), where s(x) = n^2 x and t(x) = 2x+1. See Comments.at n=31A375042
• a(n) = Sum_{k=0..n} k^2 * 2^(n-k) * binomial(n,k).at n=10A383136