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 | 1 |
| 1 | 6 |
| 2 | 37 |
| 3 | 234 |
| 4 | 1513 |
| 5 | 9966 |
| 6 | 66637 |
| 7 | 450834 |
| 8 | 3077713 |
| 9 | 21153366 |
| 10 | 146120437 |
| 11 | 1013077434 |
| 12 | 7042713913 |
| 13 | 49054856766 |
| 14 | 342163294237 |
| 15 | 2389039544034 |
| 16 | 16692759230113 |
| 17 | 116696726720166 |
| 18 | 816114147588037 |
| 19 | 5708984335850634 |