Number of -n..n arrays x(0..3) of 4 elements with zero sum and elements alternately strictly increasing and strictly decreasing.

A200058

Number of -n..n arrays x(0..3) of 4 elements with zero sum and elements alternately strictly increasing and strictly decreasing.

Terms

    a(0) =4a(1) =26a(2) =78a(3) =172a(4) =324a(5) =546a(6) =850a(7) =1252a(8) =1764a(9) =2398a(10) =3170a(11) =4092a(12) =5176a(13) =6438a(14) =7890a(15) =9544a(16) =11416a(17) =13518a(18) =15862a(19) =18464a(20) =21336a(21) =24490a(22) =27942a(23) =31704a(24) =35788a(25) =40210a(26) =44982a(27) =50116a(28) =55628a(29) =61530

External references