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 | 144 |
| 4 | 256 |
| 5 | 768 |
| 6 | 2304 |
| 7 | 5856 |
| 8 | 14884 |
| 9 | 42700 |
| 10 | 122500 |
| 11 | 320600 |
| 12 | 839056 |
| 13 | 2361448 |
| 14 | 6646084 |
| 15 | 17633520 |
| 16 | 46785600 |
| 17 | 130315680 |
| 18 | 362978704 |
| 19 | 970889920 |
| 20 | 2596921600 |
| 21 | 7186175360 |
| 22 | 19885512256 |
| 23 | 53475523456 |
| 24 | 143804774656 |
| 25 | 396160887744 |