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 | 32 |
| 5 | 166 |
| 6 | 926 |
| 7 | 5419 |
| 8 | 32816 |
| 9 | 203902 |
| 10 | 1292612 |
| 11 | 8327254 |
| 12 | 54358280 |
| 13 | 358769152 |
| 14 | 2390130038 |
| 15 | 16051344307 |
| 16 | 108548774240 |
| 17 | 738563388214 |
| 18 | 5052324028508 |
| 19 | 34727816264050 |
| 20 | 239733805643552 |
| 21 | 1661351898336676 |
| 22 | 11553558997057772 |
| 23 | 80603609263563262 |
| 24 | 563972937201926432 |