a(n) = (50^n - 1)/49.A218752a(n) = (50^n - 1)/49.Terms a(0) =0a(1) =1a(2) =51a(3) =2551a(4) =127551a(5) =6377551a(6) =318877551a(7) =15943877551a(8) =797193877551External referencesoeis: A218752