Number of nondecreasing arrangements of n numbers in -n..n with sum zero and not more than two numbers equal.
A188229
Number of nondecreasing arrangements of n numbers in -n..n with sum zero and not more than two numbers equal.
Terms
- a(0) =1a(1) =3a(2) =7a(3) =30a(4) =119a(5) =527a(6) =2395a(7) =11376a(8) =55368a(9) =275735a(10) =1397063a(11) =7185356a(12) =37419881a(13) =196993233a(14) =1046785509a(15) =5608211846a(16) =30264466262a(17) =164375822152a(18) =897938065590
External references
- oeis: A188229