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 | 56 |
| 2 | 3137 |
| 3 | 175728 |
| 4 | 9843905 |
| 5 | 551434408 |
| 6 | 30890170753 |
| 7 | 1730400996576 |
| 8 | 96933345979009 |
| 9 | 5429997775821080 |
| 10 | 304176808791959489 |
| 11 | 17039331290125552464 |
| 12 | 954506729055822897473 |
| 13 | 53469416158416207810952 |
| 14 | 2995241811600363460310785 |
| 15 | 167787010865778769985214912 |