T(n,k)=Number of arrays of n integers in -k..k with sum zero and equal numbers of elements greater than zero and less than zero.

A201811

T(n,k)=Number of arrays of n integers in -k..k with sum zero and equal numbers of elements greater than zero and less than zero.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =1a(4) =5a(5) =7a(6) =1a(7) =7a(8) =13a(9) =19a(10) =1a(11) =9a(12) =19a(13) =61a(14) =51a(15) =1a(16) =11a(17) =25a(18) =151a(19) =221a(20) =141a(21) =1a(22) =13a(23) =31a(24) =313a(25) =631a(26) =1001a(27) =393a(28) =1a(29) =15

External references