a(n+1) = a(n)*100 + 21^n, with a(1)=1.A178510a(n+1) = a(n)*100 + 21^n, with a(1)=1.Terms a(0) =1a(1) =121a(2) =12541a(3) =1263361a(4) =126530581a(5) =12657142201External referencesoeis: A178510