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 | 16 |
| 2 | 256 |
| 3 | 1152 |
| 4 | 5371 |
| 5 | 21145 |
| 6 | 86255 |
| 7 | 366330 |
| 8 | 1520815 |
| 9 | 6276388 |
| 10 | 26127518 |
| 11 | 108694123 |
| 12 | 451081599 |
| 13 | 1873587315 |
| 14 | 7785944494 |
| 15 | 32343169917 |
| 16 | 134348128428 |
| 17 | 558128458658 |
| 18 | 2318624670321 |
| 19 | 9631925841375 |
| 20 | 40012938910533 |
| 21 | 166222764096548 |