%I #9 Jun 03 2017 19:02:09
%S 1,2,7,4,14,49,8,28,98,343,16,56,196,686,2401,32,112,392,1372,4802,
%T 16807,64,224,784,2744,9604,33614,117649,128,448,1568,5488,19208,
%U 67228,235298,823543,256,896,3136,10976,38416,134456,470596,1647086
%N Triangle of numbers in which i-th row is {2^(i-j)*7^j, 0<=j<=i}; i >= 0.
%F G.f.: 1/((1 - 2*x)(1 - 7*x*y)). - _Ilya Gutkovskiy_, Jun 03 2017
%e [ 1 ]
%e [ 2, 7 ]
%e [ 4, 14, 49 ]
%e [ 8, 28, 98, 343 ]
%e ...
%Y Cf. A003591.
%K nonn,easy,tabl
%O 0,2
%A _N. J. A. Sloane_.