%I A048778
%S A048778 1,6,20,56,145,362,888,2160,5233,12654,30572,73832,178273,430418,
%T A048778 1039152,2508768,6056737,14622294,35301380,85225112,205751665,496728506,
%U A048778 1199208744
%N A048778 First partial sums of A048745; second partial sums of A048654.
%F A048778 a(n)=2*a(n-1)+a(n-2)+3*n+1; a(0)=1, a(1)=6.
%e A048778 a(n)=[ {(13/2+(9/2)*sqrt(2))(1+sqrt(2))^n - (13/2-(9/2)*sqrt(2))(1-sqrt(2))^n}/
               2*sqrt(2) ]-(3*n+7)/2.
%Y A048778 Cf. A001333, A048745, A048654.
%Y A048778 Sequence in context: A152959 A109903 A014480 this_sequence A048611 A127982 
               A109164
%Y A048778 Adjacent sequences: A048775 A048776 A048777 this_sequence A048779 A048780 
               A048781
%K A048778 easy,nonn
%O A048778 0,2
%A A048778 Barry E. Williams
%E A048778 Corrected by T. D. Noe (noe(AT)sspectra.com), Nov 08 2006