Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=1, r=5, I={2}.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =11a(6) =21a(7) =38a(8) =70a(9) =128a(10) =236a(11) =434a(12) =799a(13) =1469a(14) =2702a(15) =4969a(16) =9140a(17) =16811a(18) =30921a(19) =56872a(20) =104604a(21) =192396a(22) =353872a(23) =650872a(24) =1197141a(25) =2201885a(26) =4049898a(27) =7448923a(28) =13700706a(29) =25199527