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 | 1 |
| 2 | 4 |
| 3 | 31 |
| 4 | 343 |
| 5 | 4855 |
| 6 | 83209 |
| 7 | 1670743 |
| 8 | 38436673 |
| 9 | 996825703 |
| 10 | 28778874481 |
| 11 | 915636860023 |
| 12 | 31837734460129 |
| 13 | 1201360385000071 |
| 14 | 48899006799783889 |
| 15 | 2135779996980897175 |
| 16 | 99646497213608842561 |
| 17 | 4946194601237466540967 |