Number of distinct sets { p(i) - p(j) : 1 <= i <= j <= n } where p ranges over all permutations of [n].
A343419
Number of distinct sets { p(i) - p(j) : 1 <= i <= j <= n } where p ranges over all permutations of [n].
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =12a(6) =24a(7) =34a(8) =62a(9) =88a(10) =148a(11) =208a(12) =360a(13) =466a(14) =784a(15) =1082a(16) =1718a(17) =2278a(18) =3744a(19) =4902a(20) =7914a(21) =10486a(22) =16334a(23) =21728
External references
- oeis: A343419