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 | 99 |
| 4 | 297 |
| 5 | 891 |
| 6 | 1683 |
| 7 | 8019 |
| 8 | 5049 |
| 9 | 18513 |
| 10 | 15147 |
| 11 | 649539 |
| 12 | 31977 |
| 13 | 314721 |
| 14 | 136323 |
| 15 | 166617 |
| 16 | 95931 |
| 17 | 10673289 |
| 18 | 351747 |
| 19 | 64304361 |
| 20 | 287793 |
| 21 | 1499553 |
| 22 | 8450649 |
| 23 | 127680201 |
| 24 | 863379 |
| 25 | 20160657 |
| 26 | 99379467 |
| 27 | 5979699 |
| 28 | 5180274 |
| 29 | 1235641473 |
| 30 | 3165723 |
| 31 | 50984802 |
| 32 | 3933171 |