Number of necklace permutations of {1..n} such that every positive integer from 1 to n * (n + 1)/2 is the sum of some circular subsequence.
A325791
Number of necklace permutations of {1..n} such that every positive integer from 1 to n * (n + 1)/2 is the sum of some circular subsequence.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =20a(6) =82a(7) =252a(8) =1074a(9) =7912a(10) =39552a(11) =152680a(12) =776094a(13) =5550310a(14) =30026848a(15) =108376910
External references
- oeis: A325791