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 | 4 |
| 2 | 47616 |
| 3 | 293760 |
| 4 | 1782144 |
| 5 | 3485664 |
| 6 | 134209536 |
| 7 | 282977280 |
| 8 | 746444160 |
| 9 | 1459956960 |
| 10 | 1684126080 |
| 11 | 1716728832 |
| 12 | 27298252800 |
| 13 | 41233360896 |
| 14 | 376591138560 |
| 15 | 719045268480 |
| 16 | 1622308746240 |
| 17 | 38965526046720 |
| 18 | 41769966551040 |
| 19 | 985261739212800 |
| 20 | 3067660098994176 |