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

A188227

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

Terms

    a(0) =1a(1) =3a(2) =12a(3) =81a(4) =598a(5) =4859a(6) =41748a(7) =374820a(8) =3475284a(9) =33053399a(10) =320869264a(11) =3167899567a(12) =31721907390a(13) =321494911644

External references