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={0,2}.
A080006
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={0,2}.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =3a(5) =5a(6) =8a(7) =16a(8) =27a(9) =51a(10) =91a(11) =164a(12) =298a(13) =536a(14) =972a(15) =1755a(16) =3172a(17) =5735a(18) =10363a(19) =18735a(20) =33861a(21) =61204a(22) =110628a(23) =199957a(24) =361427a(25) =653277a(26) =1180800a(27) =2134300a(28) =3857748a(29) =6972892
External references
- oeis: A080006