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 | 286 |
| 10 | 719 |
| 11 | 1841 |
| 12 | 4763 |
| 13 | 12477 |
| 14 | 32947 |
| 15 | 87735 |
| 16 | 235162 |
| 17 | 634212 |
| 18 | 1719325 |
| 19 | 4683368 |
| 20 | 12810871 |
| 21 | 35177357 |
| 22 | 96926335 |
| 23 | 267909285 |
| 24 | 742641309 |
| 25 | 2064029034 |
| 26 | 5750500663 |
| 27 | 16057186086 |
| 28 | 44929879114 |
| 29 | 125962026154 |
| 30 | 353773417487 |
| 31 | 995269027339 |