Number of strictly increasing arrangements of n nonzero numbers in -n..n with sum zero.
A188115
Number of strictly increasing arrangements of n nonzero numbers in -n..n with sum zero.
Terms
- a(0) =0a(1) =2a(2) =2a(3) =8a(4) =16a(5) =52a(6) =152a(7) =484a(8) =1536a(9) =5064a(10) =16946a(11) =57528a(12) =197616a(13) =686588a(14) =2407538a(15) =8510428a(16) =30300268a(17) =108575996a(18) =391301260a(19) =1417520988a(20) =5159160792a(21) =18857230104a(22) =69193592020a(23) =254802169904a(24) =941383915572
External references
- oeis: A188115