Number of strictly increasing sequences of n integers 0 < u_1 < ... < u_n such that 1/u_1 + 1/(u_1 + u_2) + ... + 1/(u_1 + ... + u_n) = n/(n+1).
A340772
Number of strictly increasing sequences of n integers 0 < u_1 < ... < u_n such that 1/u_1 + 1/(u_1 + u_2) + ... + 1/(u_1 + ... + u_n) = n/(n+1).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =24a(5) =276a(6) =21707a(7) =2227892
External references
- oeis: A340772