Number of -n..n arrays x(0..6) of 7 elements with zero sum and no two neighbors equal.

A199709

Number of -n..n arrays x(0..6) of 7 elements with zero sum and no two neighbors equal.

Terms

    a(0) =56a(1) =2642a(2) =27854a(3) =149942a(4) =559028a(5) =1643204a(6) =4099204a(7) =9059092a(8) =18251656a(9) =34171380a(10) =60292468a(11) =101279218a(12) =163252890a(13) =254042820a(14) =383508158a(15) =563826638a(16) =809873706a(17) =1139548482a(18) =1574209250a(19) =2139036592a(20) =2863528108a(21) =3781894246a(22) =4933615190

External references