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={-1,1}.
A080005
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={-1,1}.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =7a(6) =11a(7) =19a(8) =35a(9) =62a(10) =107a(11) =186a(12) =328a(13) =578a(14) =1012a(15) =1771a(16) =3107a(17) =5455a(18) =9568a(19) =16774a(20) =29417a(21) =51603a(22) =90513a(23) =158741a(24) =278404a(25) =488301a(26) =856448a(27) =1502116a(28) =2634532a(29) =4620700
External references
- oeis: A080005