Number of permutations of {1..n} such that every positive integer from 1 to n * (n + 1)/2 is the sum of some circular subsequence.
A325790
Number of 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) =2a(3) =6a(4) =16a(5) =100a(6) =492a(7) =1764a(8) =8592a(9) =71208a(10) =395520a(11) =1679480a(12) =9313128a(13) =72154030a(14) =420375872a(15) =1625653650
External references
- oeis: A325790