%I A002278
%S A002278 0,4,44,444,4444,44444,444444,4444444,44444444,444444444,4444444444,
%T A002278 44444444444,444444444444,4444444444444,44444444444444,
%U A002278 444444444444444,4444444444444444,44444444444444444
%N A002278 4(10^n - 1)/9.
%F A002278 a(n)=10*a(n-1)+4, with a(0)=0 [From Paolo P. Lava (ppl(AT)spl.at), Jan 
               23 2009]
%Y A002278 Sequence in context: A043039 A002754 A105038 this_sequence A112897 A163013 
               A087813
%Y A002278 Adjacent sequences: A002275 A002276 A002277 this_sequence A002279 A002280 
               A002281
%K A002278 easy,nonn
%O A002278 0,2
%A A002278 N. J. A. Sloane (njas(AT)research.att.com).