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 | 5 |
| 2 | 33 |
| 3 | 209 |
| 4 | 1281 |
| 5 | 7745 |
| 6 | 46593 |
| 7 | 279809 |
| 8 | 1679361 |
| 9 | 10077185 |
| 10 | 60465153 |
| 11 | 362795009 |
| 12 | 2176778241 |
| 13 | 13060685825 |
| 14 | 78364147713 |
| 15 | 470184951809 |
| 16 | 2821109841921 |
| 17 | 16926659313665 |
| 18 | 101559956406273 |
| 19 | 609359739486209 |
| 20 | 3656158439014401 |
| 21 | 21936950638280705 |
| 22 | 131621703838072833 |