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 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 78 |
| 6 | 171 |
| 7 | 300 |
| 8 | 2850 |
| 9 | 8256 |
| 10 | 9453 |
| 11 | 14706 |
| 12 | 120786 |
| 13 | 208335 |
| 14 | 399171 |
| 15 | 405450 |
| 16 | 416328 |
| 17 | 448878 |
| 18 | 720600 |
| 19 | 5877306 |
| 20 | 6046503 |
| 21 | 6835753 |
| 22 | 9350650 |
| 23 | 10122750 |
| 24 | 18431556 |
| 25 | 19130205 |
| 26 | 22596003 |
| 27 | 35309406 |
| 28 | 499169406 |
| 29 | 934394835 |
| 30 | 969430528 |
| 31 | 999335571 |
| 32 | 1059265378 |
| 33 | 1730160900 |