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 | 27 |
| 2 | 729 |
| 3 | 9515 |
| 4 | 76092 |
| 5 | 440628 |
| 6 | 2026448 |
| 7 | 7829639 |
| 8 | 26375691 |
| 9 | 79507149 |
| 10 | 218578373 |
| 11 | 555979549 |
| 12 | 1323191288 |
| 13 | 2972776392 |
| 14 | 6350443334 |
| 15 | 12975277251 |
| 16 | 25482263325 |
| 17 | 48302292951 |
| 18 | 88682057873 |
| 19 | 158180868607 |
| 20 | 274824912452 |
| 21 | 466153399196 |