%I A139238
%S A139238 4,24,96,1920,6144,122880,393216,7864320,528482304
%N A139238 First differences of Mersenne numbers A001348.
%F A139238 a(n) = A001348(n+1) - A001348(n).
%e A139238 a(2)=24 because A001348(2)=7 and A001348(2+1)=31 then 31-7 = 24.
%Y A139238 Cf. A001348, A139228, A139231, A139234, A139239, A139240, A139241, A139242, 
               A139243.
%Y A139238 Sequence in context: A091143 A119920 A100738 this_sequence A139231 A052462 
               A048806
%Y A139238 Adjacent sequences: A139235 A139236 A139237 this_sequence A139239 A139240 
               A139241
%K A139238 easy,nonn
%O A139238 1,1
%A A139238 Omar E. Pol (info(AT)polprimos.com), Apr 19 2008