Number of 3X3X3 triangular 0..n arrays with some element plus some adjacent element totalling n+1 exactly once.

A270511

Number of 3X3X3 triangular 0..n arrays with some element plus some adjacent element totalling n+1 exactly once.

Terms

    a(0) =15a(1) =144a(2) =1137a(3) =4584a(4) =15843a(5) =40392a(6) =95109a(7) =189936a(8) =362487a(9) =625440a(10) =1048665a(11) =1643544a(12) =2526027a(13) =3699864a(14) =5343213a(15) =7443552a(16) =10259679a(17) =13751856a(18) =18280257a(19) =23764680a(20) =30689715a(21) =38919144a(22) =49087317a(23) =60984144a(24) =75421383a(25) =92094912a(26) =112023849

External references