Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=3, r=3, I={-2,1,2}.

A079983

Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=3, r=3, I={-2,1,2}.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =6a(6) =12a(7) =20a(8) =35a(9) =60a(10) =114a(11) =207a(12) =375a(13) =671a(14) =1213a(15) =2180a(16) =3954a(17) =7139a(18) =12892a(19) =23250a(20) =41996a(21) =75793a(22) =136891a(23) =247133a(24) =446211a(25) =805505a(26) =1454390a(27) =2625744a(28) =4740788a(29) =8559108

External references