Triangle read by rows: T(n,k) is the number of down-up permutations on [n] whose peaks have k rises.
A194365
Triangle read by rows: T(n,k) is the number of down-up permutations on [n] whose peaks have k rises.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =0a(6) =1a(7) =1a(8) =0a(9) =2a(10) =3a(11) =0a(12) =3a(13) =10a(14) =3a(15) =0a(16) =8a(17) =38a(18) =15a(19) =0a(20) =15a(21) =121a(22) =121a(23) =15a(24) =0a(25) =48a(26) =540a(27) =692a(28) =105a(29) =0
External references
- oeis: A194365