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 | 8 |
| 1 | 1 |
| 2 | 9 |
| 3 | 28 |
| 4 | 105 |
| 5 | 286 |
| 6 | 918 |
| 7 | 2871 |
| 8 | 8977 |
| 9 | 27892 |
| 10 | 87084 |
| 11 | 271635 |
| 12 | 847182 |
| 13 | 2641991 |
| 14 | 8240325 |
| 15 | 25700488 |
| 16 | 80156033 |
| 17 | 249994997 |
| 18 | 779700654 |
| 19 | 2431777739 |
| 20 | 7584375260 |