Number of -n..n arrays x(0..6) of 7 elements with zero sum and nonzero first and second differences.

A200459

Number of -n..n arrays x(0..6) of 7 elements with zero sum and nonzero first and second differences.

Terms

    a(0) =14a(1) =1582a(2) =19802a(3) =115140a(4) =451708a(5) =1375006a(6) =3513884a(7) =7910100a(8) =16176994a(9) =30639164a(10) =54582252a(11) =92444962a(12) =150029642a(13) =234839570a(14) =356372880a(15) =526276044a(16) =758938962a(17) =1071722528a(18) =1485196016a(19) =2023848468a(20) =2716453852a(21) =3596089776a(22) =4701336350

External references