A166217 - OEIS

%I #4 Mar 31 2012 12:35:35

%S 1,34,665,8865,76249,495985,2661967,11908924,46316901,161588843,

%T 510043341,1480441810,4011008946,10193915255,24508598458,56179164262,

%U 123191992504,259647495716,528503830704,1041183396446,1991316075404

%N Number of 9X9X9 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n

%H R. H. Hardin, <a href="/A166217/b166217.txt">Table of n, a(n) for n=0..26</a>

%K nonn

%O 0,2

%A _R. H. Hardin_ Oct 09 2009