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 | 18 |
| 2 | 335 |
| 3 | 7155 |
| 4 | 176554 |
| 5 | 4985316 |
| 6 | 159168428 |
| 7 | 5681708100 |
| 8 | 224518859136 |
| 9 | 9737714177928 |
| 10 | 460132506980640 |
| 11 | 23537198603711520 |
| 12 | 1296157111841533824 |
| 13 | 76467514565810332800 |
| 14 | 4812260962479036076800 |
| 15 | 321826321845522830649600 |