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 | 1 |
| 2 | 4 |
| 3 | 15 |
| 4 | 24 |
| 5 | 81 |
| 6 | 108 |
| 7 | 351 |
| 8 | 432 |
| 9 | 1377 |
| 10 | 1620 |
| 11 | 5103 |
| 12 | 5832 |
| 13 | 18225 |
| 14 | 20412 |
| 15 | 63423 |
| 16 | 69984 |
| 17 | 216513 |
| 18 | 236196 |
| 19 | 728271 |
| 20 | 787320 |
| 21 | 2421009 |
| 22 | 2598156 |
| 23 | 7971615 |
| 24 | 8503056 |
| 25 | 26040609 |
| 26 | 27634932 |
| 27 | 84499119 |
| 28 | 89282088 |
| 29 | 272629233 |
| 30 | 286978140 |
| 31 | 875283327 |
| 32 | 918330048 |