OFFSET
1,3
COMMENTS
EXAMPLE
The numbers 0 thru 4 map to 321,312,231,213 and 132 and are included because they avoid 123. The next number, 5, maps to 123 so is excluded from a(n).
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Alford Arnold, Jul 24 2008
STATUS
approved