This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 80 |
| 3 | 970 |
| 4 | 9960 |
| 5 | 99950 |
| 6 | 999940 |
| 7 | 9999930 |
| 8 | 99999920 |
| 9 | 999999910 |
| 10 | 9999999900 |
| 11 | 99999999890 |
| 12 | 999999999880 |
| 13 | 9999999999870 |
| 14 | 99999999999860 |
| 15 | 999999999999850 |
| 16 | 9999999999999840 |
| 17 | 99999999999999830 |
| 18 | 999999999999999820 |
| 19 | 9999999999999999810 |
| 20 | 99999999999999999800 |
| 21 | 999999999999999999790 |