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) |
|---|---|
| 2 | 4 |
| 3 | 12 |
| 4 | 1938 |
| 5 | 58808 |
| 6 | 475414 |
| 7 | 2193309 |
| 8 | 7466929 |
| 9 | 20973758 |
| 10 | 51518964 |
| 11 | 114522547 |
| 12 | 235503899 |
| 13 | 454805724 |
| 14 | 833826118 |
| 15 | 1463054489 |
| 16 | 2472233877 |
| 17 | 4042999114 |
| 18 | 6424367144 |