0,2

a(n)=2*a(n-1)+a(n-2)+3*n+1; a(0)=1, a(1)=6.

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.

Cf. A001333, A048745, A048654.

Sequence in context: A152959 A109903 A014480 this_sequence A048611 A127982 A109164

Adjacent sequences: A048775 A048776 A048777 this_sequence A048779 A048780 A048781

easy,nonn

Barry E. Williams

Corrected by T. D. Noe (noe(AT)sspectra.com), Nov 08 2006