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%I #5 Mar 30 2012 16:45:53
%S 1,3,7,9,42,49,27,189,441,343,81,756,2646,4116,2401,243,2835,13230,
%T 30870,36015,16807,729,10206,59535,185220,324135,302526,117649,2187,
%U 35721,250047,972405,2268945,3176523,2470629,823543,6561,122472
%N Triangle of coefficients in expansion of (3+7x)^n.
%F G.f.: 1 / [1 - x(3+7y)].
%K tabl,nonn,easy
%O 0,2
%A _N. J. A. Sloane_.
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