a(n) is the number of I^n-symmetric chains that are not I^k-symmetric for any k dividing n.
A324919
a(n) is the number of I^n-symmetric chains that are not I^k-symmetric for any k dividing n.
Terms
- a(0) =2a(1) =2a(2) =12a(3) =28a(4) =80a(5) =180a(6) =476a(7) =1120a(8) =2772a(9) =6640a(10) =16236a(11) =38976
External references
- oeis: A324919