Number of -n..n arrays x(0..3) of 4 elements with sum zero and with zeroth through 3rd differences all nonzero.

A200040

Number of -n..n arrays x(0..3) of 4 elements with sum zero and with zeroth through 3rd differences all nonzero.

Terms

    a(0) =2a(1) =28a(2) =84a(3) =218a(4) =444a(5) =808a(6) =1330a(7) =2068a(8) =2996a(9) =4230a(10) =5740a(11) =7552a(12) =9746a(13) =12348a(14) =15304a(15) =18782a(16) =22732a(17) =27144a(18) =32162a(19) =37784a(20) =43912a(21) =50790a(22) =58332a(23) =66496a(24) =75494a(25) =85280a(26) =95736a(27) =107166a(28) =119452a(29) =132524

External references