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 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 7 |
| 9 | 28 |
| 10 | 84 |
| 11 | 210 |
| 12 | 462 |
| 13 | 924 |
| 14 | 11220 |
| 15 | 74283 |
| 16 | 354563 |
| 17 | 1363571 |
| 18 | 4482323 |
| 19 | 13058891 |
| 20 | 226630385 |
| 21 | 2101302530 |
| 22 | 13794660782 |
| 23 | 71790720848 |
| 24 | 314709809876 |
| 25 | 1206605493016 |
| 26 | 27221495651416 |
| 27 | 324504194839891 |
| 28 | 2711270620975411 |
| 29 | 17790823624994551 |