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 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 18 |
| 6 | 91 |
| 7 | 544 |
| 8 | 3842 |
| 9 | 30573 |
| 10 | 277532 |
| 11 | 2770405 |
| 12 | 30591153 |
| 13 | 366836571 |
| 14 | 4783219673 |
| 15 | 66906770461 |
| 16 | 1006000805687 |