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 | 21 |
| 2 | 322 |
| 3 | 5068 |
| 4 | 79968 |
| 5 | 1262128 |
| 6 | 19920544 |
| 7 | 314412672 |
| 8 | 4962482560 |
| 9 | 78324558592 |
| 10 | 1236223285248 |
| 11 | 19511734746112 |
| 12 | 307960380098560 |
| 13 | 4860643963478016 |
| 14 | 76717205414993920 |
| 15 | 1210853880866258944 |
| 16 | 19111320764068528128 |