a(n) = (34^n - 1)/33.A218737a(n) = (34^n - 1)/33.Terms a(0) =0a(1) =1a(2) =35a(3) =1191a(4) =40495a(5) =1376831a(6) =46812255a(7) =1591616671a(8) =54114966815External referencesoeis: A218737