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%I #2 Mar 30 2012 17:23:27
%S 1,4,9,19,38,69,134,289,520,1076,2134,4098,8376,16559,33020,66114,
%T 132119,263585,525765,1050309,2097946,4199226,8394235,16785959
%N A156790(n+1)-4*A156790(n)
%Y Cf. A156790.
%K nonn
%O 0,2
%A _Jaume Oliver Lafont_, May 03 2010
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