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 | 0 |
| 2 | 0 |
| 3 | 3 |
| 4 | 4 |
| 5 | 65 |
| 6 | 27 |
| 7 | 203 |
| 8 | 236 |
| 9 | 3489 |
| 10 | 2845 |
| 11 | 53471 |
| 12 | 21341 |
| 13 | 757913 |
| 14 | 553973 |
| 15 | 619181 |
| 16 | 1040164 |
| 17 | 29169263 |
| 18 | 16276383 |
| 19 | 193614199 |
| 20 | 116220883 |
| 21 | 32925391 |
| 22 | 10628013 |
| 23 | 320160667 |
| 24 | 455451475 |
| 25 | 22987116115 |
| 26 | 19980510667 |
| 27 | 193553388003 |
| 28 | 154777722503 |