Number of arrays of -7..7 integers x(1..n) with every x(i) in a subsequence of length 1, 2, 3 or 4 with sum zero.
A193709
Number of arrays of -7..7 integers x(1..n) with every x(i) in a subsequence of length 1, 2, 3 or 4 with sum zero.
Terms
- a(0) =1a(1) =15a(2) =183a(3) =2689a(4) =18789a(5) =182477a(6) =1749091a(7) =16567391a(8) =152394383a(9) =1433139483a(10) =13442332537a(11) =125848692733
External references
- oeis: A193709