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 | 6 |
| 3 | 20 |
| 4 | 51 |
| 5 | 102 |
| 6 | 171 |
| 7 | 244 |
| 8 | 306 |
| 9 | 340 |
| 10 | 3402 |
| 11 | 30928 |
| 12 | 257737 |
| 13 | 1982597 |
| 14 | 14161414 |
| 15 | 94409428 |
| 16 | 590058925 |
| 17 | 3470934853 |
| 18 | 19282971406 |
| 19 | 101489323191 |
| 20 | 507446615959 |
| 21 | 2416412456951 |
| 22 | 10983692986143 |
| 23 | 47755186896276 |
| 24 | 198979945401152 |