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 | 3 |
| 2 | 27 |
| 3 | 108 |
| 4 | 567 |
| 5 | 2673 |
| 6 | 13122 |
| 7 | 63423 |
| 8 | 308367 |
| 9 | 1495908 |
| 10 | 7263027 |
| 11 | 35252253 |
| 12 | 171124002 |
| 13 | 830642283 |
| 14 | 4032042867 |
| 15 | 19571909148 |
| 16 | 95004113247 |
| 17 | 461159522073 |
| 18 | 2238515585442 |
| 19 | 10865982454983 |
| 20 | 52744587633927 |
| 21 | 256027604996628 |
| 22 | 1242784103695227 |
| 23 | 6032600756055333 |
| 24 | 29282859201423042 |