Triangle read by rows: T(n,k) is the number of rooted chains starting with the cycle (1)(2)(3)...(n) of length k of permutation poset of n letters.

A375837

Triangle read by rows: T(n,k) is the number of rooted chains starting with the cycle (1)(2)(3)...(n) of length k of permutation poset of n letters.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =1a(6) =0a(7) =1a(8) =5a(9) =3a(10) =0a(11) =1a(12) =23a(13) =41a(14) =18a(15) =0a(16) =1a(17) =119a(18) =455a(19) =515a(20) =180a(21) =0a(22) =1a(23) =719a(24) =5139a(25) =10985a(26) =9255a(27) =2700a(28) =0a(29) =1

External references