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 | 1 |
| 2 | 12 |
| 3 | 81 |
| 4 | 372 |
| 5 | 1332 |
| 6 | 3984 |
| 7 | 10420 |
| 8 | 24540 |
| 9 | 53145 |
| 10 | 107436 |
| 11 | 205065 |
| 12 | 372792 |
| 13 | 649936 |
| 14 | 1092672 |
| 15 | 1779408 |
| 16 | 2817288 |
| 17 | 4350105 |
| 18 | 6567660 |
| 19 | 9716905 |
| 20 | 14114892 |
| 21 | 20163924 |
| 22 | 28368912 |
| 23 | 39357396 |
| 24 | 53902212 |
| 25 | 72947329 |
| 26 | 97636812 |
| 27 | 129347505 |
| 28 | 169725360 |
| 29 | 220726080 |
| 30 | 284659968 |
| 31 | 364241728 |