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 | 4 |
| 2 | 46 |
| 3 | 704 |
| 4 | 12341 |
| 5 | 234260 |
| 6 | 4685898 |
| 7 | 97274544 |
| 8 | 2075959314 |
| 9 | 45262862788 |
| 10 | 1003884090440 |
| 11 | 22577660493024 |
| 12 | 513698787408521 |
| 13 | 11802947663348800 |
| 14 | 273471432969603198 |
| 15 | 6382396843322710560 |
| 16 | 149902629054480517590 |
| 17 | 3540479504783000035464 |