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 | 11 |
| 2 | 396 |
| 3 | 5258 |
| 4 | 43154 |
| 5 | 241283 |
| 6 | 1053323 |
| 7 | 3813001 |
| 8 | 11887373 |
| 9 | 33107532 |
| 10 | 83570177 |
| 11 | 195642892 |
| 12 | 427116918 |
| 13 | 883782766 |
| 14 | 1736506732 |
| 15 | 3275680338 |
| 16 | 5938894018 |
| 17 | 10431199387 |
| 18 | 17749369808 |
| 19 | 29449543675 |
| 20 | 47615028191 |
| 21 | 75399727379 |