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 | 0 |
| 2 | 19 |
| 3 | 68 |
| 4 | 540 |
| 5 | 7456 |
| 6 | 78195 |
| 7 | 935121 |
| 8 | 10913850 |
| 9 | 127028268 |
| 10 | 1493618674 |
| 11 | 17461316528 |
| 12 | 204700167234 |
| 13 | 2397343348003 |
| 14 | 28083486453043 |
| 15 | 328982201480033 |
| 16 | 3853663395457966 |
| 17 | 45143074414088192 |
| 18 | 528811530208812741 |