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

A270852

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

Terms

    a(0) =0a(1) =0a(2) =30a(3) =270a(4) =1650a(5) =7344a(6) =24954a(7) =68838a(8) =164454a(9) =347916a(10) =677130a(11) =1219626a(12) =2083038a(13) =3373728a(14) =5268642a(15) =7918158a(16) =11590422a(17) =16482708a(18) =22978554a(19) =31322706a(20) =42040590a(21) =55422696a(22) =72165138a(23) =92600118a(24) =117625542a(25) =147608988a(26) =183683562a(27) =226243578

External references