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Number of 4 X 4 X 4 triangular nonnegative integer arrays with all sums of an element and its neighbors <= n.
1

%I #6 Mar 15 2023 15:32:47

%S 1,21,207,1298,6052,22824,73383,208269,534687,1264026,2788834,5802288,

%T 11477240,21726484,39571482,69652946,118924069,197575191,320248137,

%U 507608530,788356140,1201765708,1800865001,2656371783,3861528515

%N Number of 4 X 4 X 4 triangular nonnegative integer arrays with all sums of an element and its neighbors <= n.

%H R. H. Hardin, <a href="/A166190/b166190.txt">Table of n, a(n) for n=0..31</a>

%K nonn

%O 0,2

%A _R. H. Hardin_, Oct 09 2009