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 | 3 |
| 2 | 8 |
| 3 | 18 |
| 4 | 41 |
| 5 | 87 |
| 6 | 190 |
| 7 | 396 |
| 8 | 851 |
| 9 | 1761 |
| 10 | 3754 |
| 11 | 7740 |
| 12 | 16419 |
| 13 | 33777 |
| 14 | 71410 |
| 15 | 146676 |
| 16 | 309319 |
| 17 | 634605 |
| 18 | 1335680 |
| 19 | 2737830 |
| 20 | 5753393 |
| 21 | 11784519 |
| 22 | 24732602 |
| 23 | 50628768 |
| 24 | 106142095 |
| 25 | 217168749 |
| 26 | 454874296 |
| 27 | 930285390 |
| 28 | 1947021505 |