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 | 3 |
| 2 | 8 |
| 3 | 22 |
| 4 | 67 |
| 5 | 229 |
| 6 | 897 |
| 7 | 4023 |
| 8 | 20512 |
| 9 | 117516 |
| 10 | 748031 |
| 11 | 5237959 |
| 12 | 40014097 |
| 13 | 331156423 |
| 14 | 2951484420 |
| 15 | 28184585550 |
| 16 | 287085799927 |
| 17 | 3106996356945 |
| 18 | 35603555478689 |
| 19 | 430652619722011 |
| 20 | 5483239453957132 |
| 21 | 73305511708044652 |
| 22 | 1026690239891085363 |
| 23 | 15033060056592047307 |