Number of nondecreasing arrangements of n numbers x(i) in -(n+1)..(n+1) with the sum of sign(x(i))*x(i)^2 zero.

A187996

Number of nondecreasing arrangements of n numbers x(i) in -(n+1)..(n+1) with the sum of sign(x(i))*x(i)^2 zero.

Terms

    a(0) =1a(1) =4a(2) =5a(3) =25a(4) =64a(5) =286a(6) =1055a(7) =5191a(8) =24135a(9) =122238a(10) =626982a(11) =3324754a(12) =17890884a(13) =98093994a(14) =544680909a(15) =3062711643a(16) =17400096265a(17) =99802843644a(18) =577238731571

External references