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 | 8 |
| 1 | 1 |
| 2 | 41 |
| 3 | 142 |
| 4 | 933 |
| 5 | 4741 |
| 6 | 26660 |
| 7 | 143697 |
| 8 | 788453 |
| 9 | 4293286 |
| 10 | 23454801 |
| 11 | 127953981 |
| 12 | 698467368 |
| 13 | 3811712633 |
| 14 | 20803963753 |
| 15 | 113540081302 |
| 16 | 619672701957 |
| 17 | 3381980484909 |
| 18 | 18457878595412 |
| 19 | 100737602247769 |
| 20 | 549796303339413 |