Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=2, r=2, I={0,1}.
A080013
Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=2, r=2, I={0,1}.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =3a(9) =4a(10) =6a(11) =9a(12) =12a(13) =16a(14) =24a(15) =33a(16) =46a(17) =64a(18) =91a(19) =127a(20) =177a(21) =249a(22) =349a(23) =489a(24) =684a(25) =960a(26) =1345a(27) =1884a(28) =2640a(29) =3700
External references
- oeis: A080013