Number of -n..n arrays x(0..3) of 4 elements with zero sum and nonzero first and second differences.

A200456

Number of -n..n arrays x(0..3) of 4 elements with zero sum and nonzero first and second differences.

Terms

    a(0) =4a(1) =44a(2) =142a(3) =342a(4) =678a(5) =1148a(6) =1832a(7) =2744a(8) =3874a(9) =5334a(10) =7114a(11) =9192a(12) =11708a(13) =14644a(14) =17962a(15) =21826a(16) =26206a(17) =31044a(18) =36544a(19) =42660a(20) =49310a(21) =56734a(22) =64866a(23) =73616a(24) =83256a(25) =93696a(26) =104834a(27) =116970a(28) =130006a(29) =143824

External references