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

A200205

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

Terms

    a(0) =12a(1) =68a(2) =186a(3) =422a(4) =798a(5) =1316a(6) =2064a(7) =3048a(8) =4254a(9) =5802a(10) =7682a(11) =9864a(12) =12500a(13) =15564a(14) =19010a(15) =23022a(16) =27558a(17) =32556a(18) =38232a(19) =44528a(20) =51366a(21) =58994a(22) =67338a(23) =76304a(24) =86172a(25) =96852a(26) =108234a(27) =120630a(28) =133934a(29) =148020

External references