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 | 9 |
| 3 | 116 |
| 4 | 900 |
| 5 | 7836 |
| 6 | 71865 |
| 7 | 640513 |
| 8 | 5706113 |
| 9 | 51056136 |
| 10 | 456396688 |
| 11 | 4078122040 |
| 12 | 36448590305 |
| 13 | 325763780945 |
| 14 | 2911451082361 |
| 15 | 26020738951500 |
| 16 | 232557947597540 |
| 17 | 2078461123504804 |
| 18 | 18576017680577225 |
| 19 | 166021162669244641 |