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 | 3 |
| 2 | 28 |
| 3 | 315 |
| 4 | 3876 |
| 5 | 50358 |
| 6 | 678112 |
| 7 | 9365499 |
| 8 | 131809060 |
| 9 | 1882294128 |
| 10 | 27193657008 |
| 11 | 396600597198 |
| 12 | 5829739893264 |
| 13 | 86262567856650 |
| 14 | 1283677784658528 |
| 15 | 19196304797150715 |
| 16 | 288295493121264420 |
| 17 | 4346056823245242420 |