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 | 2 |
| 3 | 6 |
| 4 | 11 |
| 5 | 26 |
| 6 | 61 |
| 7 | 132 |
| 8 | 290 |
| 9 | 638 |
| 10 | 1390 |
| 11 | 3012 |
| 12 | 6496 |
| 13 | 13940 |
| 14 | 29793 |
| 15 | 63450 |
| 16 | 134628 |
| 17 | 284764 |
| 18 | 600596 |
| 19 | 1263304 |
| 20 | 2650684 |
| 21 | 5549117 |
| 22 | 11592553 |
| 23 | 24170837 |
| 24 | 50306424 |
| 25 | 104527509 |
| 26 | 216852455 |
| 27 | 449232326 |
| 28 | 929378744 |
| 29 | 1920295902 |
| 30 | 3963077103 |