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 | 2 |
| 3 | 7 |
| 4 | 151 |
| 5 | 257 |
| 6 | 1823 |
| 7 | 3048 |
| 8 | 5588 |
| 9 | 6875 |
| 10 | 7201 |
| 11 | 8973 |
| 12 | 24099 |
| 13 | 5249801 |
| 14 | 9177919 |
| 15 | 18926164 |
| 16 | 70079434 |
| 17 | 78647747 |
| 18 | 705686794 |
| 19 | 2530414370 |
| 20 | 3557744074 |
| 21 | 25364328389 |
| 22 | 32487653727 |
| 23 | 66843959963 |