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 | 4 |
| 2 | 104 |
| 3 | 1206 |
| 4 | 13132 |
| 5 | 148432 |
| 6 | 1692480 |
| 7 | 18893254 |
| 8 | 205592002 |
| 9 | 2192518424 |
| 10 | 23040437586 |
| 11 | 239444000256 |
| 12 | 2466260663869 |
| 13 | 25213885065100 |
| 14 | 256147799888040 |
| 15 | 2588077377850470 |
| 16 | 26026306944344453 |
| 17 | 260646721044701192 |
| 18 | 2600801818956016811 |
| 19 | 25867424061321255322 |
| 20 | 256529866716776061643 |