20054016

Appears in sequences

• a(n) = binomial(n,2) * 2^(n-1).at n=18A001815
• Smallest number beginning with the digits of n that has exactly n prime factors (counted with multiplicity).at n=19A109686
• Number of n-colorings of the 3 X 3 X 3 triangular grid.at n=18A182788
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 387", based on the 5-celled von Neumann neighborhood.at n=24A287955
• a(n) is the number of subsets of {1,2,...,n} that contain exactly two odd numbers.at n=34A330592
• Inverse binomial transform of A317614.at n=16A346174