a(n) = (49^n - 1)/48.A218753a(n) = (49^n - 1)/48.Terms a(0) =0a(1) =1a(2) =50a(3) =2451a(4) =120100a(5) =5884901a(6) =288360150a(7) =14129647351a(8) =692352720200External referencesoeis: A218753