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%I #4 Mar 14 2015 11:52:32
%S 1,4,28,260,2916,37712,547240,8751688,152309648,2857598164,
%T 57379111732,1225920973324,27737038620452,661937827915872,
%U 16605857832896944,436636765049489648,12002769920717089856,344160801015503753892
%N Column 3 of triangle A152406; also, column 0 of matrix 4th power of A152406.
%C Matrix powers of triangle T=A152406 satisfy:
%C column k of T^(j+1) = column j of T^(k+1) for all j>=0, k>=0.
%Y Cf. A152406; A152407, A152408, A152409.
%K nonn
%O 0,2
%A _Paul D. Hanna_, Dec 05 2008
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