Number T(n,k) of permutations p of [n] with no fixed points such that |{ j : |p(j)-j| = 1 }| = k; triangle T(n,k), n >= 0, 0 <= k <= n, read by rows.
A323671
Number T(n,k) of permutations p of [n] with no fixed points such that |{ j : |p(j)-j| = 1 }| = k; triangle T(n,k), n >= 0, 0 <= k <= n, read by rows.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =0a(7) =0a(8) =2a(9) =0a(10) =1a(11) =2a(12) =3a(13) =2a(14) =1a(15) =4a(16) =12a(17) =14a(18) =8a(19) =6a(20) =0a(21) =29a(22) =68a(23) =82a(24) =54a(25) =25a(26) =6a(27) =1a(28) =206a(29) =496
External references
- oeis: A323671