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) |
|---|---|
| 0 | 14 |
| 1 | 84 |
| 2 | 504 |
| 3 | 3192 |
| 4 | 21252 |
| 5 | 147420 |
| 6 | 1057224 |
| 7 | 7791168 |
| 8 | 58727214 |
| 9 | 451137596 |
| 10 | 3521923944 |
| 11 | 27878644080 |
| 12 | 223353322920 |
| 13 | 1808402199660 |
| 14 | 14778966163752 |
| 15 | 121784464712064 |
| 16 | 1011022286145816 |
| 17 | 8449458780183120 |
| 18 | 71042841567457760 |
| 19 | 600615322603936920 |
| 20 | 5103281457829103220 |