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 | 18 |
| 2 | 205 |
| 3 | 1890 |
| 4 | 15421 |
| 5 | 116298 |
| 6 | 830845 |
| 7 | 5709330 |
| 8 | 38119741 |
| 9 | 249026778 |
| 10 | 1599719485 |
| 11 | 10142356770 |
| 12 | 63639854461 |
| 13 | 396031348458 |
| 14 | 2448208592125 |
| 15 | 15053605980210 |
| 16 | 92160458747581 |
| 17 | 562225198873338 |
| 18 | 3419937140824765 |