Number of permutations of 2..n+1 with all sums of 2 through 4 adjacent terms squared respectively unique.
A147743
Number of permutations of 2..n+1 with all sums of 2 through 4 adjacent terms squared respectively unique.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =720a(6) =4608a(7) =33952a(8) =305092a(9) =2822386a(10) =31085630a(11) =363851312a(12) =4526935712a(13) =61820980344
External references
- oeis: A147743