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 | 0 |
| 2 | 10416 |
| 3 | 1166592 |
| 4 | 69194232 |
| 5 | 2366570752 |
| 6 | 51316746768 |
| 7 | 747741998592 |
| 8 | 7633243745820 |
| 9 | 56276359749120 |
| 10 | 306558278858160 |
| 11 | 1255428754917120 |
| 12 | 3916392495228360 |
| 13 | 9399341113166592 |
| 14 | 17480786291963792 |
| 15 | 25316999607653376 |
| 16 | 28634752793916486 |
| 17 | 25316999607653376 |