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 | 5 |
| 4 | 17 |
| 5 | 97 |
| 6 | 587 |
| 7 | 4291 |
| 8 | 33109 |
| 9 | 319967 |
| 10 | 3106433 |
| 11 | 35554459 |
| 12 | 419889707 |
| 13 | 5632467097 |
| 14 | 77342295637 |
| 15 | 1201240551077 |
| 16 | 18804238105133 |
| 17 | 328322081898745 |
| 18 | 5832312989183807 |
| 19 | 113154541564902427 |
| 20 | 2229027473451951265 |
| 21 | 47899977701182298255 |
| 22 | 1037672943682453127645 |