Number of permutations of 2..n+1 with all sums of 2 through 2 adjacent terms squared respectively unique.
A147741
Number of permutations of 2..n+1 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) =342720a(9) =3159264a(10) =35662560a(11) =423017280a(12) =5316721920a(13) =74414502720
External references
- oeis: A147741