0,2

a(n)=2*a(n-1)+a(n-2)+4; a(0)=1, a(1)=6.

a(n)=[ {(5+3*sqrt(2))(1+sqrt(2)^n - (5-3*sqrt(2))(1-sqrt(2))^n}/2*sqrt(2) ]-2

Adjacent sequences: A048743 A048744 A048745 this_sequence A048747 A048748 A048749

Sequence in context: A099858 A062020 A066183 this_sequence A026382 A054492 A128525

easy,nonn

Barry E. Williams

Corrected and extended by T. D. Noe (noe(AT)sspectra.com), Nov 07 2006