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 | 6 |
| 2 | 36 |
| 3 | 146 |
| 4 | 511 |
| 5 | 1512 |
| 6 | 4032 |
| 7 | 9752 |
| 8 | 21942 |
| 9 | 46252 |
| 10 | 92504 |
| 11 | 176484 |
| 12 | 323554 |
| 13 | 572264 |
| 14 | 981024 |
| 15 | 1634776 |
| 16 | 2656511 |
| 17 | 4218786 |
| 18 | 6562556 |
| 19 | 10016006 |
| 20 | 15024009 |
| 21 | 22177584 |
| 22 | 32258304 |
| 23 | 46282704 |
| 24 | 65567164 |
| 25 | 91792792 |
| 26 | 127097712 |
| 27 | 174169352 |