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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 37 |
| 6 | 114 |
| 7 | 367 |
| 8 | 1248 |
| 9 | 4446 |
| 10 | 16526 |
| 11 | 63914 |
| 12 | 256642 |
| 13 | 1067388 |
| 14 | 4590201 |
| 15 | 20376849 |
| 16 | 93240065 |
| 17 | 439190047 |
| 18 | 2126970482 |
| 19 | 10579017047 |
| 20 | 53983000003 |
| 21 | 282345671127 |
| 22 | 1512273916781 |
| 23 | 8287870474339 |
| 24 | 46438619162441 |
| 25 | 265840311066579 |