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 | 46 |
| 2 | 154 |
| 3 | 190 |
| 4 | 2656 |
| 5 | 6490 |
| 6 | 44650 |
| 7 | 318250 |
| 8 | 1360810 |
| 9 | 1503370 |
| 10 | 1788490 |
| 11 | 3214090 |
| 12 | 103712410 |
| 13 | 3915380170 |
| 14 | 6077111050 |
| 15 | 9796360330 |
| 16 | 10828121356 |
| 17 | 33086522327050 |
| 18 | 35966517350410 |
| 19 | 11577093570201610 |
| 20 | 16726040141635450 |
| 21 | 576460762503970816 |