cp's OEIS Frontend

A271028 Number of nXnXn triangular 0..2 arrays with some element less than a w, nw or ne neighbor exactly once.

%I A271028 #5 Mar 29 2016 07:42:34
%S A271028 0,8,72,450,2420,12010,56754,259628,1160936,5105144,22166760,95301932,
%T A271028 406510934,1722863088,7263024536,30481913682,127442700854,
%U A271028 531088604958,2206913662766,9147940180122,37836235984334,156187232759706
%N A271028 Number of nXnXn triangular 0..2 arrays with some element less than a w, nw or ne neighbor exactly once.
%C A271028 Column 2 of A271034.
%H A271028 R. H. Hardin, <a href="/A271028/b271028.txt">Table of n, a(n) for n = 1..30</a>
%e A271028 Some solutions for n=4
%e A271028 .....0........1........0........0........1........2........0........0
%e A271028 ....0.0......1.1......0.1......0.0......1.1......2.2......1.2......0.2
%e A271028 ...0.0.0....1.1.2....1.1.1....2.0.1....0.1.1....0.2.2....2.2.2....0.2.2
%e A271028 ..0.2.2.1..0.2.2.2..0.1.1.1..2.2.2.2..0.1.1.1..0.2.2.2..0.2.2.2..0.1.2.2
%Y A271028 Cf. A271034.
%K A271028 nonn
%O A271028 1,2
%A A271028 _R. H. Hardin_, Mar 29 2016