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 | 4 |
| 5 | 16 |
| 6 | 46 |
| 7 | 106 |
| 8 | 226 |
| 9 | 514 |
| 10 | 1306 |
| 11 | 3466 |
| 12 | 9002 |
| 13 | 22634 |
| 14 | 56330 |
| 15 | 142026 |
| 16 | 364743 |
| 17 | 945303 |
| 18 | 2448511 |
| 19 | 6323695 |
| 20 | 16336885 |
| 21 | 42363693 |
| 22 | 110340297 |
| 23 | 288229377 |
| 24 | 753920796 |
| 25 | 1973799396 |
| 26 | 5174280216 |
| 27 | 13588243696 |
| 28 | 35748326836 |
| 29 | 94188788164 |
| 30 | 248464963876 |
| 31 | 656148369796 |