%I A048755
%S A048755 1,7,20,52,129,315,764,1848,4465,10783,26036,62860,151761,366387,
%T A048755 884540,2135472,5155489,12446455,30048404,72543268
%N A048755 Partial sums of A048693.
%F A048755 a(n)=2*a(n-1)+a(n-2)+5; a(0)=1, a(1)=6.
%F A048755 a(n)=[ {(6+(7/2)*sqrt(2))(1+sqrt(2))^n - (6-(7/2)*sqrt(2))(1-sqrt(2))^n}/ 
               2*sqrt(2) ]-5/2.
%Y A048755 Cf. A048693, A048654, A048655.
%Y A048755 Sequence in context: A100206 A007044 A047862 this_sequence A055267 A009370 
               A009372
%Y A048755 Adjacent sequences: A048752 A048753 A048754 this_sequence A048756 A048757 
               A048758
%K A048755 easy,nonn
%O A048755 0,2
%A A048755 Barry E. Williams