Number of n-digit terms in A353007.

Terms

a(0) =5a(1) =21a(2) =122a(3) =765a(4) =5000a(5) =34581a(6) =249152a(7) =1843485a(8) =14184320a(9) =111117141a(10) =890892032a(11) =7338139005a(12) =60554071040a(13) =518102719701