Number of permutations of 1..n with all differences of elements separated by distances 1 through 5 being respectively unique.
A170811
Number of permutations of 1..n with all differences of elements separated by distances 1 through 5 being respectively unique.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =12a(4) =40a(5) =116a(6) =200a(7) =444a(8) =760a(9) =2160a(10) =4368a(11) =7852a(12) =14040a(13) =24284a(14) =42312a(15) =79340a(16) =152764a(17) =320920a(18) =688780a(19) =1577244a(20) =3763512a(21) =9412948
External references
- oeis: A170811