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) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 9 |
| 5 | 18 |
| 6 | 35 |
| 7 | 66 |
| 8 | 123 |
| 9 | 228 |
| 10 | 421 |
| 11 | 776 |
| 12 | 1429 |
| 13 | 2630 |
| 14 | 4839 |
| 15 | 8902 |
| 16 | 16375 |
| 17 | 30120 |
| 18 | 55401 |
| 19 | 101900 |
| 20 | 187425 |
| 21 | 344730 |
| 22 | 634059 |
| 23 | 1166218 |
| 24 | 2145011 |
| 25 | 3945292 |
| 26 | 7256525 |
| 27 | 13346832 |
| 28 | 24548653 |
| 29 | 45152014 |
| 30 | 83047503 |
| 31 | 152748174 |
| 32 | 280947695 |
| 33 | 516743376 |