%I A024088
%S A024088 0,7,63,511,4095,32767,262143,2097151,16777215,134217727,
%T A024088 1073741823,8589934591,68719476735,549755813887,4398046511103,
%U A024088 35184372088831,281474976710655,2251799813685247,18014398509481983
%N A024088 8^n-1.
%C A024088 Numbers whose base 8 or octal representation is 777777.......7. - Zerinvary 
               Lajos (zerinvarylajos(AT)yahoo.com), Feb 03 2007
%F A024088 G.f.: 1/(1-8*x)-1/(1-x). E.g.f.: e^(8*x)-e^x. [From Mohammad K. Azarian 
               (azarian(AT)evansville.edu), Jan 14 2009]
%F A024088 a(n) = A000225(n)*A001576(n). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), 
               Feb 15 2009]
%F A024088 a(n)=8*a(n-1)+7 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Oct 30 2009]
%e A024088 For n=2, a(2)=8*0+7=7; n=3, a(3)=8*7+7=63; n=4, a(4)=8*63+7=511 [From 
               Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 30 2009]
%o A024088 (Other) sage: [gaussian_binomial(3*n,1,2) for n in xrange(0,19)] # [From 
               Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 28 2009]
%Y A024088 Sequence in context: A165759 A166153 A123009 this_sequence A155132 A015684 
               A051579
%Y A024088 Adjacent sequences: A024085 A024086 A024087 this_sequence A024089 A024090 
               A024091
%K A024088 nonn
%O A024088 0,2
%A A024088 N. J. A. Sloane (njas(AT)research.att.com).