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 | 2 |
| 3 | 8 |
| 4 | 58 |
| 5 | 632 |
| 6 | 9654 |
| 7 | 202484 |
| 8 | 5843954 |
| 9 | 233064944 |
| 10 | 12916716526 |
| 11 | 998745087980 |
| 12 | 108135391731690 |
| 13 | 16434082400952296 |
| 14 | 3513344943520006118 |
| 15 | 1058030578581541945316 |
| 16 | 449389062270642095128546 |
| 17 | 269419653009366144571801568 |
| 18 | 228157953744571034350576205790 |