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%I #6 Dec 26 2016 05:50:11
%S 2,5,20,89,809,10704,145989,2054864,19686928,128199160
%N Engel expansion of e to the base Pi.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PierceExpansion.html">Pierce Expansion</a>
%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Engel_expansion">Engel Expansion</a>
%e e = Pi/2 + Pi^2/(2*5) + Pi^3/(2*5*20) + Pi^4/(2*5*20*89) + Pi^5/(2*5*20*89*809) + ...
%Y Cf. A232325.
%K nonn,more
%O 0,1
%A _G. C. Greubel_, Dec 25 2016