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 | 7 |
| 3 | 108 |
| 4 | 422 |
| 5 | 2195 |
| 6 | 16006 |
| 7 | 115773 |
| 8 | 738989 |
| 9 | 4837309 |
| 10 | 32657747 |
| 11 | 219582492 |
| 12 | 1461795891 |
| 13 | 9752902800 |
| 14 | 65247730522 |
| 15 | 436241303976 |
| 16 | 2914287342877 |
| 17 | 19473374657852 |
| 18 | 130152068036883 |
| 19 | 869816886352210 |
| 20 | 5812664008298957 |