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 | 2 |
| 2 | 120 |
| 3 | 4002 |
| 4 | 93500 |
| 5 | 1687002 |
| 6 | 24836196 |
| 7 | 309182762 |
| 8 | 3337508646 |
| 9 | 31830097752 |
| 10 | 272125000774 |
| 11 | 2109875558208 |
| 12 | 14977318285254 |
| 13 | 98118326104708 |
| 14 | 597217934730774 |
| 15 | 3397036441760412 |
| 16 | 18148572883826236 |
| 17 | 91470993083858322 |
| 18 | 436643312483178036 |
| 19 | 1981038544180652162 |