0,2

a(n)=2*(10^(2*n)-1)/9+10^(2*n), with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Dec 19 2007

Sequence in context: A031700 A092775 A031599 this_sequence A121916 A097843 A013475

Adjacent sequences: A131967 A131968 A131969 this_sequence A131971 A131972 A131973

nonn,base

Paul Curtz (bpcrtz(AT)free.fr), Oct 06 2007