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 | 13 |
| 3 | 69 |
| 4 | 347 |
| 5 | 1736 |
| 6 | 3993 |
| 7 | 41059 |
| 8 | 215842 |
| 9 | 498546 |
| 10 | 2202398 |
| 11 | 10866824 |
| 12 | 54261537 |
| 13 | 637482331 |
| 14 | 3370498978 |
| 15 | 7788765114 |
| 16 | 34411960682 |
| 17 | 169793870966 |
| 18 | 847836388608 |
| 19 | 4238615459929 |
| 20 | 49803023550277 |
| 21 | 263320090876701 |
| 22 | 1323752940946163 |