Number of permutations of 1..n with all sums of 2 through 2 adjacent terms squared respectively unique.
A147736
Number of permutations of 1..n with all sums of 2 through 2 adjacent terms squared respectively unique.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =720a(6) =5040a(7) =37440a(8) =323520a(9) =3312000a(10) =34368480a(11) =409907904a(12) =5169149280a(13) =71094545192
External references
- oeis: A147736