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) |
|---|---|
| 1 | 9 |
| 2 | 91 |
| 3 | 90 |
| 4 | 910 |
| 5 | 9030 |
| 6 | 90090 |
| 7 | 903210 |
| 8 | 9699690 |
| 9 | 900029130 |
| 10 | 9146807670 |
| 11 | 901741380540 |
| 12 | 9426343036110 |
| 13 | 900781858106130 |
| 14 | 90004386781078770 |
| 15 | 914836017997511610 |
| 16 | 90100977291211496610 |
| 17 | 9000008798605567472730 |
| 18 | 900002983747159323401370 |