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 | 8 |
| 2 | 58 |
| 3 | 396 |
| 4 | 2595 |
| 5 | 16500 |
| 6 | 102500 |
| 7 | 625000 |
| 8 | 3753125 |
| 9 | 22250000 |
| 10 | 130468750 |
| 11 | 757812500 |
| 12 | 4365234375 |
| 13 | 24960937500 |
| 14 | 141796875000 |
| 15 | 800781250000 |
| 16 | 4498291015625 |
| 17 | 25146484375000 |
| 18 | 139953613281250 |
| 19 | 775756835937500 |
| 20 | 4283905029296875 |
| 21 | 23574829101562500 |
| 22 | 129318237304687500 |
| 23 | 707244873046875000 |