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) |
|---|---|
| 1 | 20 |
| 2 | 400 |
| 3 | 3282 |
| 4 | 26723 |
| 5 | 181626 |
| 6 | 1238275 |
| 7 | 8077216 |
| 8 | 52884231 |
| 9 | 342253692 |
| 10 | 2219051847 |
| 11 | 14342182788 |
| 12 | 92762468854 |
| 13 | 599440899640 |
| 14 | 3874622754209 |
| 15 | 25038222274359 |
| 16 | 161813225250872 |
| 17 | 1045666263619612 |
| 18 | 6757468106419697 |
| 19 | 43668245333968330 |