The 'ij' in 'vijf' has been counted as two letters here. Counting it as one or two letters are both common in Dutch.
Table of n, a(n) for n=0..100.
Index entries for sequences related to number of letters in n
Charles R Greathouse IV, Table of n, a(n) for n=0..100, annotated with names.
A007485 gives the sequence when the 'ij' is considered as one letter.
Sequence in context: A318706 A298199 A282623 * A163400 A090972 A318241
Adjacent sequences: A090586 A090587 A090588 * A090590 A090591 A090592
André Engels, Dec 03 2003
a(0) and a(79)-a(100) from Charles R Greathouse IV, Aug 26 2017