Number of strictly increasing arrangements of n numbers in -(n+2)..(n+2) with sum zero.

A188176

Number of strictly increasing arrangements of n numbers in -(n+2)..(n+2) with sum zero.

Terms

    a(0) =1a(1) =4a(2) =13a(3) =43a(4) =141a(5) =480a(6) =1656a(7) =5744a(8) =20094a(9) =70922a(10) =252117a(11) =901723a(12) =3243531a(13) =11728606a(14) =42611990a(15) =155484150a(16) =569585274a(17) =2094177794a(18) =7725489976a(19) =28588154238a(20) =106095329440a(21) =394792407478

External references