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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 25 |
| 4 | 61 |
| 5 | 152 |
| 6 | 344 |
| 7 | 755 |
| 8 | 1633 |
| 9 | 3566 |
| 10 | 7844 |
| 11 | 17409 |
| 12 | 38572 |
| 13 | 84583 |
| 14 | 183130 |
| 15 | 392467 |
| 16 | 838016 |
| 17 | 1793923 |
| 18 | 3863499 |
| 19 | 8369084 |
| 20 | 18177361 |
| 21 | 39421910 |
| 22 | 85087006 |
| 23 | 182500900 |
| 24 | 389186986 |
| 25 | 826803387 |
| 26 | 1754407066 |
| 27 | 3726873588 |
| 28 | 7935854525 |
| 29 | 16936911826 |
| 30 | 36183082015 |
| 31 | 77225453397 |