694980

Appears in sequences

• a(0) = a(1) = 1, a(2) = x, a(3) = 2x^2, a(n) = x*(n-1)*a(n-1) + Sum_{j=2..n-2} (j-1)*a(j)*a(n-j), n>=4 and for x = 3.at n=7A113130
• a(n) = the product of all distinct positive (nonzero) integers that, when written in binary, occur as substrings in the binary representation of n.at n=26A165153
• The Szeged index of the triangle-shaped benzenoid T_n (see Fig. 5.7 of the Diudea et al. reference).at n=9A245833