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 | 2 |
| 2 | 9 |
| 3 | 69 |
| 4 | 567 |
| 5 | 5112 |
| 6 | 48114 |
| 7 | 469179 |
| 8 | 4691115 |
| 9 | 47849940 |
| 10 | 495893502 |
| 11 | 5206886874 |
| 12 | 55273052646 |
| 13 | 592211326464 |
| 14 | 6395881806180 |
| 15 | 69555215111319 |
| 16 | 761015877850035 |
| 17 | 8371174661041500 |
| 18 | 92523509359662150 |
| 19 | 1027010953940099238 |