21291

Appears in sequences

• Number of unlabeled strongly connected n-state 2-input automata.at n=4A027835
• Numbers n which are divisors of the number produced by concatenating (n-5), (n-4), ... (n-1) in that order.at n=2A088870
• Number of strings of numbers x(i=1..8) in 0..n with sum i^2*x(i)^3 equal to 64*n^3.at n=15A184323
• Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,3,4 for x=0,1,2,3,4.at n=13A196133
• Expansion of Product_{k>=1} 1/(1 - x^k)^(sigma_1(k)-k), where sigma_1(k) = sum of divisors of k (A000203).at n=26A318784
• Number of lone-child-avoiding locally disjoint rooted identity trees whose leaves are integer partitions whose multiset union is an integer partition of n.at n=11A331686