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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 6 |
| 6 | 26 |
| 7 | 71 |
| 8 | 413 |
| 9 | 1456 |
| 10 | 10576 |
| 11 | 45541 |
| 12 | 397023 |
| 13 | 2020656 |
| 14 | 20551376 |
| 15 | 120686411 |
| 16 | 1402815833 |
| 17 | 9336345856 |
| 18 | 122087570176 |
| 19 | 908138776681 |
| 20 | 13194844482843 |
| 21 | 108480272749056 |
| 22 | 1733786041150976 |
| 23 | 15611712012050351 |
| 24 | 272197308765744053 |
| 25 | 2664103110372192256 |