| <!DOCTYPE series PUBLIC "fibonacci numbers"> | |
| <series.root base="1" step="s(n-2) + s(n-1)"> | |
| <element i="0">1</element> | |
| <element i="1">1</element> | |
| <element i="2">2</element> | |
| <element i="3">3</element> | |
| <element i="4">5</element> | |
| <element i="5">8</element> | |
| ... | |
| </series.root> |