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={-1,0,1}.
A080002
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={-1,0,1}.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =0a(7) =0a(8) =1a(9) =3a(10) =1a(11) =1a(12) =1a(13) =6a(14) =6a(15) =4a(16) =5a(17) =10a(18) =20a(19) =16a(20) =20a(21) =25a(22) =50a(23) =60a(24) =66a(25) =85a(26) =125a(27) =190a(28) =216a(29) =281
External references
- oeis: A080002