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) |
|---|---|
| 2 | 4 |
| 3 | 39 |
| 4 | 190 |
| 5 | 651 |
| 6 | 1792 |
| 7 | 4242 |
| 8 | 8988 |
| 9 | 17490 |
| 10 | 31812 |
| 11 | 54769 |
| 12 | 90090 |
| 13 | 142597 |
| 14 | 218400 |
| 15 | 325108 |
| 16 | 472056 |
| 17 | 670548 |
| 18 | 934116 |
| 19 | 1278795 |
| 20 | 1723414 |
| 21 | 2289903 |
| 22 | 3003616 |
| 23 | 3893670 |
| 24 | 4993300 |
| 25 | 6340230 |
| 26 | 7977060 |
| 27 | 9951669 |
| 28 | 12317634 |
| 29 | 15134665 |
| 30 | 18469056 |
| 31 | 22394152 |
| 32 | 26990832 |
| 33 | 32348008 |
| 34 | 38563140 |