Triangle T(n,k), n >= 2, n+1 <= k <= 2*n-1, number of permutations p of 1,...,n, with max(p(i)+p(i-1), i=2..n) = k.
A064484
Triangle T(n,k), n >= 2, n+1 <= k <= 2*n-1, number of permutations p of 1,...,n, with max(p(i)+p(i-1), i=2..n) = k.
Terms
- a(0) =2a(1) =2a(2) =4a(3) =4a(4) =8a(5) =12a(6) =4a(7) =32a(8) =36a(9) =48a(10) =8a(11) =64a(12) =216a(13) =192a(14) =240a(15) =8a(16) =208a(17) =648a(18) =1536a(19) =1200a(20) =1440a(21) =16a(22) =416a(23) =3024a(24) =6144a(25) =12000a(26) =8640a(27) =10080a(28) =16a(29) =1280
External references
- oeis: A064484