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

A200208

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

Terms

    a(0) =90a(1) =3940a(2) =37226a(3) =187530a(4) =667620a(5) =1910006a(6) =4664818a(7) =10140128a(8) =20184636a(9) =37418930a(10) =65462890a(11) =109237270a(12) =175066404a(13) =271040286a(14) =407440210a(15) =596771596a(16) =854269356a(17) =1198528290a(18) =1651314456a(19) =2238353836a(20) =2990103390a(21) =3941357552a(22) =5132247474

External references