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 | 5 |
| 2 | 7 |
| 3 | 13 |
| 4 | 14 |
| 5 | 20 |
| 6 | 30 |
| 7 | 45 |
| 8 | 76 |
| 9 | 630 |
| 10 | 688 |
| 11 | 2310 |
| 12 | 8896 |
| 13 | 133888 |
| 14 | 537051136 |
| 15 | 1631268870 |
| 16 | 35184418226176 |
| 17 | 144115191028645888 |
| 18 | 2305843021024854016 |