Triangle read by rows: T(n,k) is the number of alternating permutations on [n+1] with 1 in position k+1, 0<=k<=n.
A104345
Triangle read by rows: T(n,k) is the number of alternating permutations on [n+1] with 1 in position k+1, 0<=k<=n.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =2a(7) =3a(8) =3a(9) =2a(10) =5a(11) =8a(12) =6a(13) =8a(14) =5a(15) =16a(16) =25a(17) =20a(18) =20a(19) =25a(20) =16a(21) =61a(22) =96a(23) =75a(24) =80a(25) =75a(26) =96a(27) =61a(28) =272a(29) =427
External references
- oeis: A104345