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 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 49 |
| 4 | 378 |
| 5 | 3136 |
| 6 | 27363 |
| 7 | 247597 |
| 8 | 2302511 |
| 9 | 21872361 |
| 10 | 211336755 |
| 11 | 2070577285 |
| 12 | 20522662832 |
| 13 | 205411356794 |
| 14 | 2073258075175 |
| 15 | 21078157565623 |
| 16 | 215658366319375 |
| 17 | 2218853063356937 |
| 18 | 22942886758494094 |
| 19 | 238284942878492146 |
| 20 | 2484736162773443446 |