Number of permutations of 1..n with i-10<=p(i)<=i+6.

Terms

a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =720a(6) =5040a(7) =35280a(8) =246960a(9) =1728720a(10) =12101040a(11) =79108560a(12) =494049000a(13) =3006564984a(14) =18109683246a(15) =109214866454a(16) =664787648911