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 | 6 |
| 2 | 36 |
| 3 | 271 |
| 4 | 2101 |
| 5 | 19296 |
| 6 | 185946 |
| 7 | 2029621 |
| 8 | 23654671 |
| 9 | 303054846 |
| 10 | 4153493496 |
| 11 | 61501843771 |
| 12 | 969988075021 |
| 13 | 16326593796396 |
| 14 | 291081828746646 |
| 15 | 5490558646391521 |
| 16 | 109092080140450771 |
| 17 | 2278805715594223146 |
| 18 | 49897959213869259396 |
| 19 | 1143087784199443461271 |