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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 13 |
| 5 | 37 |
| 6 | 31 |
| 7 | 605 |
| 8 | 1411 |
| 9 | 7174 |
| 10 | 15567 |
| 11 | 608953 |
| 12 | 78903 |
| 13 | 334535 |
| 14 | 611552 |
| 15 | 105928 |
| 16 | 2557047 |
| 17 | 2979162 |
| 18 | 3263358 |
| 19 | 6242520 |
| 20 | 7825254 |
| 21 | 37404834 |
| 22 | 267494881 |
| 23 | 639174488 |