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 | 2 |
| 2 | 7 |
| 3 | 42 |
| 4 | 374 |
| 5 | 4391 |
| 6 | 63637 |
| 7 | 1095362 |
| 8 | 21823226 |
| 9 | 493898216 |
| 10 | 12515588806 |
| 11 | 351062669154 |
| 12 | 10798972965266 |
| 13 | 361471373319171 |
| 14 | 13080119556342713 |
| 15 | 508813238759275712 |
| 16 | 21174032937728251318 |
| 17 | 938646693399848483498 |