Triangle read by rows: T(n,k) (n>=0, 0<=k<=A002620(n-1)) is the number of permutations of [n] with k nestings.
A263776
Triangle read by rows: T(n,k) (n>=0, 0<=k<=A002620(n-1)) is the number of permutations of [n] with k nestings.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =1a(5) =14a(6) =8a(7) =2a(8) =42a(9) =45a(10) =25a(11) =7a(12) =1a(13) =132a(14) =220a(15) =198a(16) =112a(17) =44a(18) =12a(19) =2a(20) =429a(21) =1001a(22) =1274a(23) =1092a(24) =700a(25) =352a(26) =140a(27) =42a(28) =9a(29) =1
External references
- oeis: A263776