Number of permutations satisfying -k <= p(i)-i <= r and p(i)-i not in I, i=1..n, with k=1, r=4, I={1,2}.
A079972
Number of permutations satisfying -k <= p(i)-i <= r and p(i)-i not in I, i=1..n, with k=1, r=4, I={1,2}.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =6a(7) =8a(8) =11a(9) =17a(10) =27a(11) =41a(12) =60a(13) =88a(14) =132a(15) =200a(16) =301a(17) =449a(18) =669a(19) =1001a(20) =1502a(21) =2252a(22) =3370a(23) =5040a(24) =7543a(25) =11297a(26) =16919a(27) =25329a(28) =37912a(29) =56752
External references
- oeis: A079972