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 | 22 |
| 4 | 118 |
| 5 | 1803 |
| 6 | 8182 |
| 7 | 131062 |
| 8 | 524278 |
| 9 | 498820 |
| 10 | 271127480 |
| 11 | 2147483638 |
| 12 | 44060320367 |
| 13 | 967030303245 |
| 14 | 7907414671310 |
| 15 | 49672464783624 |
| 16 | 5545884378065500 |
| 17 | 125222315103997360 |
| 18 | 2305843009213693942 |
| 19 | 130613131595363896897 |