89272

Appears in sequences

• Number of edge-labeled series-reduced trees with n nodes.at n=8A007831
• Number of ON cells at n-th stage of three-dimensional version of the cellular automaton A160410, using cubes.at n=29A160428
• a(n) = (n + 1)*(6*n^4 - 21*n^3 + 31*n^2 - 31*n + 30)/30.at n=14A267691
• Number of nX3 0..1 arrays with every element unequal to 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.at n=16A304258
• Number of excursions of length n with Motzkin-steps avoiding the consecutive steps UU, HH and DD.at n=21A329671
• a(n) = Sum_{k=1..n} (k/gcd(n, k))^3.at n=26A343513