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 | 2 |
| 4 | 3 |
| 5 | 5 |
| 6 | 9 |
| 7 | 18 |
| 8 | 35 |
| 9 | 72 |
| 10 | 154 |
| 11 | 342 |
| 12 | 783 |
| 13 | 1840 |
| 14 | 4435 |
| 15 | 10936 |
| 16 | 27556 |
| 17 | 70853 |
| 18 | 185687 |
| 19 | 495487 |
| 20 | 1344957 |
| 21 | 3710633 |
| 22 | 10397339 |
| 23 | 29568649 |
| 24 | 85290742 |
| 25 | 249391642 |
| 26 | 738821757 |
| 27 | 2216465269 |
| 28 | 6730493990 |
| 29 | 20678209930 |
| 30 | 64252006060 |
| 31 | 201840008712 |
| 32 | 640802084316 |
| 33 | 2055394684174 |