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={1,2}.
A079989
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={1,2}.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =13a(6) =27a(7) =51a(8) =103a(9) =221a(10) =498a(11) =1064a(12) =2240a(13) =4728a(14) =10076a(15) =21559a(16) =46075a(17) =98085a(18) =208759a(19) =444727a(20) =948151a(21) =2021335a(22) =4307861a(23) =9179111a(24) =19560273a(25) =41686260a(26) =88842852a(27) =189337896a(28) =403497908a(29) =859893060
External references
- oeis: A079989