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 | 3 |
| 3 | 19 |
| 4 | 195 |
| 5 | 2791 |
| 6 | 51423 |
| 7 | 1167979 |
| 8 | 32067675 |
| 9 | 1064281951 |
| 10 | 43806954183 |
| 11 | 2376985075939 |
| 12 | 186194963282595 |
| 13 | 22598045194449271 |
| 14 | 4259417828951807343 |
| 15 | 1200382884654622348699 |
| 16 | 490727012583769876310955 |
| 17 | 286998078380075662131967951 |
| 18 | 238889878466868543045084230103 |