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 | 60 |
| 3 | 912 |
| 4 | 17617 |
| 5 | 321815 |
| 6 | 5897476 |
| 7 | 107793872 |
| 8 | 1968061359 |
| 9 | 35917517449 |
| 10 | 655347656612 |
| 11 | 11956214759290 |
| 12 | 218119695889901 |
| 13 | 3979116037755048 |
| 14 | 72589531392230391 |
| 15 | 1324217776135660990 |
| 16 | 24157052394845982633 |