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 | 40 |
| 4 | 262 |
| 5 | 2103 |
| 6 | 17210 |
| 7 | 146590 |
| 8 | 1274284 |
| 9 | 11271819 |
| 10 | 101051725 |
| 11 | 915754298 |
| 12 | 8372478663 |
| 13 | 77114370790 |