Number of nondecreasing arrangements of n nonzero numbers in -n..n with sum zero.
A188326
Number of nondecreasing arrangements of n nonzero numbers in -n..n with sum zero.
Terms
- a(0) =0a(1) =2a(2) =4a(3) =20a(4) =86a(5) =424a(6) =2128a(7) =11200a(8) =60372a(9) =333254a(10) =1872728a(11) =10688284a(12) =61792756a(13) =361247006a(14) =2132290212a(15) =12692489494a(16) =76115308712a(17) =459476777038
External references
- oeis: A188326