This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A345206 #19 Jul 12 2021 16:28:40 %S A345206 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2, %T A345206 3,3,4,4,4,4,4,4,4,4,5,5,6,6,8,8,8,8,8,8,8,8,9,9,10,10,12,12,12,12,12, %U A345206 12,12,12,13,13,14,14,16,16,18,18,18,18,18,18,18,18,19,19,20,20,22,22,24,24,27 %N A345206 Maximum number of unit cubes that can be fully enclosed in n unit cubes. %C A345206 Cubes are assumed to be aligned in a 3D grid. Cubes with an exposed edge or corner are not considered enclosed. %C A345206 The Moore neighborhood of a cube in a 3-D grid consists of the 26 that share a face, an edge, or a vertex with it. - _N. J. A. Sloane_, Jul 12 2021 %e A345206 a(26) = 1 as the number of neighbors in Moore's neighborhood is 26 in 3D. %Y A345206 Cf. A345205. 3D equivalent to A008642. %K A345206 nonn %O A345206 8,27 %A A345206 _Abraham Maxfield_, Jun 11 2021