Triangle read by rows, arising in enumeration of permutations by cyclic valleys, cycles and fixed points.
A217202
Triangle read by rows, arising in enumeration of permutations by cyclic valleys, cycles and fixed points.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =7a(4) =2a(5) =28a(6) =16a(7) =131a(8) =118a(9) =16a(10) =690a(11) =892a(12) =272a(13) =4033a(14) =7060a(15) =3468a(16) =272a(17) =25864a(18) =58608a(19) =41088a(20) =7936a(21) =180265a(22) =510812a(23) =479772a(24) =156176a(25) =7936a(26) =1354458a(27) =4675912a(28) =5635224a(29) =2665184
External references
- oeis: A217202