OFFSET
1,2
EXAMPLE
1
11
0
13 31 121 211 1111
14 23 32 41 113 122 131 212 221 311 1112 1121 1211 2111 11111
0
16 25 34 43 52 61 115 124 142 151 ...
...
CROSSREFS
KEYWORD
base,nonn,tabf
AUTHOR
Amarnath Murthy, Apr 13 2003
EXTENSIONS
More terms from David Wasserman, Aug 30 2004
STATUS
approved