Number of arrays of n integers in -4..4 with sum zero and equal numbers of elements greater than zero and less than zero.
A201807
Number of arrays of n integers in -4..4 with sum zero and equal numbers of elements greater than zero and less than zero.
Terms
- a(0) =1a(1) =9a(2) =25a(3) =313a(4) =1401a(5) =15681a(6) =90609a(7) =909945a(8) =6105913a(9) =57290209a(10) =421304049a(11) =3799765201a(12) =29595440785a(13) =261111392985
External references
- oeis: A201807