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.
A020916
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.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =0a(6) =0a(7) =24a(8) =96a(9) =0a(10) =0a(11) =10000a(12) =60736a(13) =0a(14) =0a(15) =20511168a(16) =168661760a(17) =0a(18) =0a(19) =134002359296a(21) =0a(22) =0a(25) =0a(26) =0
External references
- oeis: A020916