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 | 3 |
| 3 | 10 |
| 4 | 39 |
| 5 | 158 |
| 6 | 674 |
| 7 | 2944 |
| 8 | 13191 |
| 9 | 60078 |
| 10 | 277890 |
| 11 | 1300536 |
| 12 | 6151078 |
| 13 | 29346036 |
| 14 | 141088632 |
| 15 | 682825140 |
| 16 | 3324172359 |
| 17 | 16267134462 |
| 18 | 79975707362 |
| 19 | 394833880540 |
| 20 | 1956620531762 |
| 21 | 9729300574580 |
| 22 | 48529814786620 |
| 23 | 242757311049680 |
| 24 | 1217508537475894 |