Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=3, r=3, I={-1,0,2}.
A079987
Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=3, r=3, I={-1,0,2}.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =2a(5) =3a(6) =5a(7) =7a(8) =15a(9) =29a(10) =49a(11) =84a(12) =149a(13) =268a(14) =484a(15) =855a(16) =1508a(17) =2684a(18) =4784a(19) =8516a(20) =15134a(21) =26873a(22) =47782a(23) =85004a(24) =151149a(25) =268704a(26) =477685a(27) =849299a(28) =1510163a(29) =2685089
External references
- oeis: A079987