Number of nondecreasing arrangements of n numbers in -(n+2)..(n+2) with sum zero and not more than two numbers equal.

A188231

Number of nondecreasing arrangements of n numbers in -(n+2)..(n+2) with sum zero and not more than two numbers equal.

Terms

    a(0) =1a(1) =5a(2) =17a(3) =81a(4) =374a(5) =1818a(6) =8964a(7) =45225a(8) =231596a(9) =1202495a(10) =6313385a(11) =33473871a(12) =178991409a(13) =964308854a(14) =5229780968a(15) =28531772394a(16) =156491164870a(17) =862470267275

External references