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 | 4 |
| 2 | 4 |
| 3 | 11 |
| 4 | 15 |
| 5 | 21 |
| 6 | 52 |
| 7 | 118 |
| 8 | 220 |
| 9 | 408 |
| 10 | 852 |
| 11 | 1764 |
| 12 | 3460 |
| 13 | 6796 |
| 14 | 13732 |
| 15 | 27708 |
| 16 | 55140 |
| 17 | 109788 |
| 18 | 220132 |
| 19 | 441244 |
| 20 | 881380 |
| 21 | 1760796 |
| 22 | 3523812 |
| 23 | 7051548 |
| 24 | 14098660 |
| 25 | 28189468 |
| 26 | 56387812 |
| 27 | 112791324 |
| 28 | 225564900 |
| 29 | 451098396 |
| 30 | 902232292 |
| 31 | 1804527388 |
| 32 | 3608983780 |