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 | 3 |
| 2 | 4 |
| 3 | 24 |
| 4 | 1968 |
| 5 | 3264 |
| 6 | 5016 |
| 7 | 60456 |
| 8 | 1016508 |
| 9 | 4420164 |
| 10 | 12055512 |
| 11 | 14365608 |
| 12 | 25726728 |
| 13 | 27896424 |
| 14 | 66562308 |
| 15 | 72764736 |
| 16 | 98734968 |
| 17 | 175186656 |
| 18 | 224868312 |
| 19 | 253694928 |
| 20 | 288657204 |
| 21 | 386668344 |
| 22 | 421575408 |
| 23 | 504737748 |
| 24 | 630645456 |
| 25 | 1493548000 |
| 26 | 1653797796 |
| 27 | 2120325012 |
| 28 | 2221315152 |