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%I #2 Mar 30 2012 18:37:09
%S 1,3,18,156,1714,22368,333910,5566728,101955050,2027241660,
%T 43372029642,991507256804,24084513595722,618791039789272,
%U 16751222781082878,476239112549941408,14179227111187986642,441017358981919297508
%N Column 2 of triangle A138271; also, column 0 of matrix power A138271^3.
%Y Cf. A138271; A138272, A138273; A138275.
%K nonn
%O 0,2
%A _Paul D. Hanna_, Mar 11 2008
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