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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 4 |
| 4 | 42 |
| 5 | 718 |
| 6 | 26262 |
| 7 | 1878422 |
| 8 | 256204460 |
| 9 | 67525498676 |
| 10 | 34969833809892 |
| 11 | 35954978661632864 |
| 12 | 73737437034063350534 |
| 13 | 302166248212488958298674 |
| 14 | 2475711390267267917290354410 |
| 15 | 40563960064630744031043287569378 |
| 16 | 1329219366981359393514586291328267704 |