219604

Appears in sequences

• Coefficients of Chebyshev polynomials.at n=19A005584
• a(n) = (5n+1)*C(4n,n)/(3n+1).at n=6A052204
• The Szeged index of the parallelogram-shaped benzenoid Q_k (see Fig. 5.7 of the Diudea et al. reference).at n=5A245832
• G.f.: Product_{m>0} (1 + x^m + 2!*x^(2*m) + 3!*x^(3*m) + 4!*x^(4*m) + 5!*x^(5*m)).at n=23A293250