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 | 5 |
| 3 | 29 |
| 4 | 140 |
| 5 | 841 |
| 6 | 4653 |
| 7 | 26589 |
| 8 | 151081 |
| 9 | 859264 |
| 10 | 4891841 |
| 11 | 27832869 |
| 12 | 158410277 |
| 13 | 901506585 |
| 14 | 5130598532 |
| 15 | 29198860965 |
| 16 | 166174106629 |
| 17 | 945717892865 |
| 18 | 5382196223185 |
| 19 | 30630747783536 |
| 20 | 174323378425833 |
| 21 | 992095956013449 |