Triangle read by rows: T(n,k) is the number of permutations of [n] that have k isolated entries (0 <= k <= n).
A180196
Triangle read by rows: T(n,k) is the number of permutations of [n] that have k isolated entries (0 <= k <= n).
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =0a(5) =1a(6) =1a(7) =2a(8) =0a(9) =3a(10) =2a(11) =2a(12) =9a(13) =0a(14) =11a(15) =3a(16) =11a(17) =9a(18) =44a(19) =0a(20) =53a(21) =7a(22) =20a(23) =75a(24) =44a(25) =265a(26) =0a(27) =309a(28) =14a(29) =73
External references
- oeis: A180196