Number of identity bracelets with n labeled beads of 2 colors.
A032337
Number of identity bracelets with n labeled beads of 2 colors.
Terms
- a(0) =2a(1) =2a(2) =0a(3) =0a(4) =0a(5) =720a(6) =10080a(7) =241920a(8) =5080320a(9) =108864000a(10) =2474841600a(11) =60833203200
External references
- oeis: A032337