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

A270258

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

Terms

    a(0) =0a(1) =66a(2) =768a(3) =4428a(4) =14976a(5) =42750a(6) =96768a(7) =203448a(8) =376320a(9) =668250a(10) =1094400a(11) =1746756a(12) =2636928a(13) =3910998a(14) =5569536a(15) =7830000a(16) =10672128a(17) =14404338a(18) =18973440a(19) =24800700a(20) =31785600a(21) =40486446a(22) =50738688a(23) =63264168a(24) =77815296a(25) =95306250a(26) =115385088

External references