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 | 3 |
| 3 | 6 |
| 4 | 23 |
| 5 | 112 |
| 6 | 561 |
| 7 | 3519 |
| 8 | 39132 |
| 9 | 437312 |
| 10 | 4828352 |
| 11 | 70006528 |
| 12 | 1118710784 |
| 13 | 17726058496 |
| 14 | 298648682496 |
| 15 | 7527505969152 |