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 | 5 |
| 2 | 33 |
| 3 | 279 |
| 4 | 2895 |
| 5 | 35685 |
| 6 | 509985 |
| 7 | 8294895 |
| 8 | 151335135 |
| 9 | 3061162125 |
| 10 | 68000295825 |
| 11 | 1645756410375 |
| 12 | 43105900812975 |
| 13 | 1214871076343925 |
| 14 | 36659590336994625 |
| 15 | 1179297174137457375 |
| 16 | 40288002704636061375 |
| 17 | 1456700757237661060125 |