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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 543 |
| 6 | 118629 |
| 7 | 12564636 |
| 8 | 907001550 |
| 9 | 51751693161 |
| 10 | 2527016053023 |
| 11 | 110737868741742 |
| 12 | 4489929936371880 |
| 13 | 171944175793168779 |
| 14 | 6309813148166785257 |
| 15 | 224210698542088771968 |