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 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 135 |
| 4 | 1992 |
| 5 | 30166 |
| 6 | 458885 |
| 7 | 6965225 |
| 8 | 105358102 |
| 9 | 1588998756 |
| 10 | 23915093535 |
| 11 | 359444209015 |
| 12 | 5397938190512 |
| 13 | 81022969645346 |
| 14 | 1215801458118985 |
| 15 | 18240857019892005 |
| 16 | 273644796626023722 |
| 17 | 4104936328561231936 |