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 | 0 |
| 2 | 5 |
| 3 | 40 |
| 4 | 306 |
| 5 | 2387 |
| 6 | 19617 |
| 7 | 166104 |
| 8 | 1440298 |
| 9 | 12711386 |
| 10 | 113761519 |
| 11 | 1029517130 |
| 12 | 9401960980 |
| 13 | 86516370000 |