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 | 2 |
| 4 | 8 |
| 5 | 38 |
| 6 | 193 |
| 7 | 1243 |
| 8 | 8971 |
| 9 | 77039 |
| 10 | 711719 |
| 11 | 7557974 |
| 12 | 85038784 |
| 13 | 1075040038 |
| 14 | 14252911927 |
| 15 | 208885729397 |
| 16 | 3187988600057 |
| 17 | 53129157538097 |
| 18 | 917244939572929 |
| 19 | 17127419083026706 |
| 20 | 329981266766790136 |
| 21 | 6823452191056396526 |
| 22 | 145118585159785011041 |