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 | 22 |
| 3 | 138 |
| 4 | 889 |
| 5 | 4921 |
| 6 | 26687 |
| 7 | 154539 |
| 8 | 870270 |
| 9 | 4437621 |
| 10 | 20367762 |
| 11 | 86589471 |
| 12 | 388661761 |
| 13 | 2366418106 |
| 14 | 18602433227 |
| 15 | 142978182070 |
| 16 | 952075901928 |
| 17 | 5434361620523 |
| 18 | 27064481351856 |
| 19 | 120477919973804 |
| 20 | 497320625548529 |
| 21 | 2051776298637086 |
| 22 | 9590295679377844 |
| 23 | 54933121828772931 |