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 | 9 |
| 2 | 81 |
| 3 | 261 |
| 4 | 841 |
| 5 | 1943 |
| 6 | 4489 |
| 7 | 8643 |
| 8 | 16641 |
| 9 | 28509 |
| 10 | 48841 |
| 11 | 77129 |
| 12 | 121801 |
| 13 | 181131 |
| 14 | 269361 |
| 15 | 382503 |
| 16 | 543169 |
| 17 | 743633 |
| 18 | 1018081 |
| 19 | 1353069 |
| 20 | 1798281 |
| 21 | 2331999 |
| 22 | 3024121 |
| 23 | 3841451 |
| 24 | 4879681 |
| 25 | 6090213 |
| 26 | 7601049 |
| 27 | 9343473 |
| 28 | 11485321 |
| 29 | 13932179 |
| 30 | 16900321 |