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}.
A080008
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}.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =2a(5) =2a(6) =3a(7) =5a(8) =11a(9) =15a(10) =24a(11) =40a(12) =68a(13) =110a(14) =177a(15) =290a(16) =480a(17) =783a(18) =1278a(19) =2090a(20) =3427a(21) =5609a(22) =9171a(23) =15005a(24) =24564a(25) =40200a(26) =65776a(27) =107628a(28) =176137a(29) =288244
External references
- oeis: A080008