Number of permutations of 1..2*n+2 with each element displaced by at least n.
A183245
Number of permutations of 1..2*n+2 with each element displaced by at least n.
Terms
- a(0) =9a(1) =29a(2) =112a(3) =436a(4) =1708a(5) =6724a(6) =26572a(7) =105316a(8) =418348a(9) =1664644a(10) =6632332a(11) =26450596a(12) =105566188a(13) =421556164a(14) =1684098892a(15) =6730018276a(16) =26900941228a(17) =107546369284a(18) =430013290252
External references
- oeis: A183245