OFFSET
0,2
EXAMPLE
For n = 4, a(4) = 1, since 4 is apat in Filipino, which has only 1 vowel: a.
For n = 13, a(13) = 3, since 13 is labing-tatlo in Filipino, which has 3 vowels: a, i, and o.
CROSSREFS
KEYWORD
nonn,word,easy
AUTHOR
Ray G. Opao, Jun 08 2011
STATUS
approved