Irregular triangle read by rows: T(n,k) = number of size k subsets of S_n with respect to the symmetries of the square.
A277086
Irregular triangle read by rows: T(n,k) = number of size k subsets of S_n with respect to the symmetries of the square.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =2a(9) =5a(10) =5a(11) =5a(12) =2a(13) =1a(14) =1a(15) =7a(16) =56a(17) =317a(18) =1524a(19) =5733a(20) =17728a(21) =44767a(22) =94427a(23) =166786a(24) =249624a(25) =316950a(26) =343424a(27) =316950a(28) =249624a(29) =166786
External references
- oeis: A277086