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 | 33 |
| 2 | 758 |
| 3 | 9896 |
| 4 | 79317 |
| 5 | 443353 |
| 6 | 1904490 |
| 7 | 6718440 |
| 8 | 20366673 |
| 9 | 54770809 |
| 10 | 133699830 |
| 11 | 301347872 |
| 12 | 635317397 |
| 13 | 1265529825 |
| 14 | 2400903226 |
| 15 | 4365984432 |
| 16 | 7650100929 |
| 17 | 12972006129 |
| 18 | 21363430102 |
| 19 | 34275416568 |
| 20 | 53711825909 |