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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 20 |
| 7 | 48 |
| 8 | 115 |
| 9 | 285 |
| 10 | 716 |
| 11 | 1833 |
| 12 | 4740 |
| 13 | 12410 |
| 14 | 32754 |
| 15 | 87176 |
| 16 | 233547 |
| 17 | 629540 |
| 18 | 1705809 |
| 19 | 4644231 |
| 20 | 12697500 |
| 21 | 34848694 |
| 22 | 95973026 |
| 23 | 265142431 |
| 24 | 734606478 |
| 25 | 2040683413 |
| 26 | 5682634446 |
| 27 | 15859800889 |
| 28 | 44355531103 |
| 29 | 124290064228 |
| 30 | 348904212741 |
| 31 | 981082979409 |