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 | 4 |
| 4 | 9 |
| 5 | 20 |
| 6 | 50 |
| 7 | 147 |
| 8 | 269 |
| 9 | 992 |
| 10 | 1000 |
| 11 | 4297 |
| 12 | 76468 |
| 13 | 97314 |
| 14 | 445519 |
| 15 | 1315337 |
| 16 | 2594742 |
| 17 | 3888902 |
| 18 | 91859035 |
| 19 | 92411466 |
| 20 | 1180624310 |
| 21 | 4501485474 |
| 22 | 11288114818 |
| 23 | 23434425843 |