60736

Appears in sequences

• A molecule is a row of atoms joined together by bonds; each atom has a valence (e.g., 1-3=2 is a molecule with 3 atoms); a(n) is the number of molecules with n atoms and different valencies from 1 to n.at n=12A020916
• Number of hyperforests on n unlabeled nodes, assuming that each edge contains at least two nodes, with all components of prime orders.at n=12A144979
• Array T(n,k) read by antidiagonals: T(n,k) is the number of [n,k]-triangulations in the plane, n >= 0, k >= 0.at n=50A169808
• Number of distinct solutions of sum{i=1..3}(x(2i-1)*x(2i)) = 0 (mod n), with x() only in 2..n-2.at n=21A180815
• Numbers equal to the determinant of a circulant matrix based on the base-9 digits of n.at n=18A303369