a(n) = n*12^n - 1.A064758a(n) = n*12^n - 1.Terms a(0) =11a(1) =287a(2) =5183a(3) =82943a(4) =1244159a(5) =17915903a(6) =250822655a(7) =3439853567a(8) =46438023167a(9) =619173642239External referencesoeis: A064758