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 | 46 |
| 3 | 378 |
| 4 | 3214 |
| 5 | 27896 |
| 6 | 245506 |
| 7 | 2182396 |
| 8 | 19548046 |
| 9 | 176142312 |
| 10 | 1594831736 |
| 11 | 14497410186 |
| 12 | 132224930146 |
| 13 | 1209397179048 |
| 14 | 11088872706188 |
| 15 | 101890087382168 |
| 16 | 937973964234638 |
| 17 | 8649109175873288 |
| 18 | 79872298511230120 |
| 19 | 738583466508887304 |
| 20 | 6837944227813170424 |