1,2

Starting with addition: 0*100+9^0=1 ; 1*100-9^1=91 ; 91*100+9^2

a(n)=(1/109)*[100^n-(-9)^n], with n>=1 [From Paolo P. Lava (ppl(AT)spl.at), Dec 03 2009]

Cf. A164913, A021113

Sequence in context: A054216 A109627 A095372 this_sequence A015261 A131442 A116507

Adjacent sequences: A165151 A165152 A165153 this_sequence A165155 A165156 A165157

nonn,new

M. Dols (markdols99(AT)yahoo.com), Sep 05 2009