Triangle read by rows: T(n,k) is the number of alternating max-precedes-min permutations on [n+2] with 1 in position k+2, 0<=k<=n.

A104346

Triangle read by rows: T(n,k) is the number of alternating max-precedes-min permutations on [n+2] with 1 in position k+2, 0<=k<=n.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =2a(7) =3a(8) =6a(9) =5a(10) =5a(11) =8a(12) =12a(13) =20a(14) =16a(15) =16a(16) =25a(17) =40a(18) =50a(19) =80a(20) =61a(21) =61a(22) =96a(23) =150a(24) =200a(25) =240a(26) =366a(27) =272a(28) =272a(29) =427

External references