Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=2, r=3, I={-1,1,2}.
A080000
Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=2, r=3, I={-1,1,2}.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =3a(7) =5a(8) =7a(9) =9a(10) =12a(11) =16a(12) =24a(13) =35a(14) =50a(15) =70a(16) =96a(17) =135a(18) =190a(19) =270a(20) =383a(21) =539a(22) =759a(23) =1065a(24) =1500a(25) =2116a(26) =2985a(27) =4212a(28) =5932a(29) =8356
External references
- oeis: A080000