Triangle read by rows: T(n,k) = number of permutations p of [n] such that max(|p(i)-i|)=k (n>=1, 0<=k<=n-1).
A130152
Triangle read by rows: T(n,k) = number of permutations p of [n] such that max(|p(i)-i|)=k (n>=1, 0<=k<=n-1).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =1a(7) =4a(8) =9a(9) =10a(10) =1a(11) =7a(12) =23a(13) =47a(14) =42a(15) =1a(16) =12a(17) =60a(18) =157a(19) =274a(20) =216a(21) =1a(22) =20a(23) =151a(24) =503a(25) =1227a(26) =1818a(27) =1320a(28) =1a(29) =33
External references
- oeis: A130152