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 | 3 |
| 2 | 29 |
| 3 | 286 |
| 4 | 2955 |
| 5 | 31350 |
| 6 | 338514 |
| 7 | 3701295 |
| 8 | 40849661 |
| 9 | 454114540 |
| 10 | 5077463898 |
| 11 | 57038882004 |
| 12 | 643269405230 |
| 13 | 7278603015180 |
| 14 | 82590333059025 |
| 15 | 939444489263403 |
| 16 | 10708773485661387 |
| 17 | 122299562702918348 |
| 18 | 1399055759185079316 |