Colin- Monday, May 11, 2009, 5:01:21 PM, you wrote: > My answers match the online table, unless you're thinkig of zero being > the first entry, in which case Your f(n) = Real f(n-1). Using your code and answering 211 I get 55835073295300463000000000000000000000000000 -- -Mark Wieder mwieder at ahsoftware.net