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={-1,0,2}.
A080001
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={-1,0,2}.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =4a(9) =3a(10) =4a(11) =8a(12) =10a(13) =13a(14) =16a(15) =24a(16) =36a(17) =43a(18) =59a(19) =85a(20) =115a(21) =156a(22) =207a(23) =289a(24) =401a(25) =533a(26) =729a(27) =1002a(28) =1368a(29) =1864
External references
- oeis: A080001