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 | 3 |
| 2 | 27 |
| 3 | 266 |
| 4 | 2743 |
| 5 | 29068 |
| 6 | 313633 |
| 7 | 3427358 |
| 8 | 37810605 |
| 9 | 420193609 |
| 10 | 4696967294 |
| 11 | 52753182426 |
| 12 | 594829939672 |
| 13 | 6729488070844 |
| 14 | 76349568744149 |
| 15 | 868359048628146 |
| 16 | 9897485221142239 |
| 17 | 113024337104850132 |
| 18 | 1292850211089736299 |
| 19 | 14810711124377556034 |
| 20 | 169898355365054443380 |