Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=1, r=4, I={0,2}.
A079974
Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=1, r=4, I={0,2}.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =1a(6) =3a(7) =2a(8) =5a(9) =5a(10) =9a(11) =10a(12) =16a(13) =20a(14) =30a(15) =39a(16) =56a(17) =75a(18) =106a(19) =144a(20) =201a(21) =275a(22) =382a(23) =525a(24) =727a(25) =1001a(26) =1384a(27) =1908a(28) =2636a(29) =3636
External references
- oeis: A079974