a(n) = (45^n - 1)/44.A218748a(n) = (45^n - 1)/44.Terms a(0) =0a(1) =1a(2) =46a(3) =2071a(4) =93196a(5) =4193821a(6) =188721946a(7) =8492487571a(8) =382161940696External referencesoeis: A218748