Triangle read by rows: T(n,k) (n >= 1, 0 <= k <= n-1) is the number of permutations of [0..(n-1)] of spread k.
A147679
Triangle read by rows: T(n,k) (n >= 1, 0 <= k <= n-1) is the number of permutations of [0..(n-1)] of spread k.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =0a(4) =3a(5) =3a(6) =4a(7) =8a(8) =4a(9) =8a(10) =20a(11) =25a(12) =25a(13) =25a(14) =25a(15) =144a(16) =108a(17) =108a(18) =144a(19) =108a(20) =108a(21) =630a(22) =735a(23) =735a(24) =735a(25) =735a(26) =735a(27) =735a(28) =5696a(29) =4608
External references
- oeis: A147679