81568

Appears in sequences

• Number of isosceles right triangles on a 2n X (n+1) grid.at n=14A189894
• Totients t such that the number of divisors of t equals the number of solutions of phi(x) = t.at n=37A305058
• Number of series-reduced rooted trees whose leaves are non-singleton integer partitions whose multiset union is an integer partition of n.at n=15A320295
• The inverse Euler transform of p(n) = n if n is prime, otherwise 1.at n=29A358452