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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 2 |
| 4 | 66 |
| 5 | 7998 |
| 6 | 2895570 |
| 7 | 3015624078 |
| 8 | 8890966977354 |
| 9 | 74079608267459142 |
| 10 | 1754419666770364130730 |
| 11 | 119163820122708911990211222 |
| 12 | 23431180614718394105521543222866 |
| 13 | 13448652672256961901980839022683943838 |
| 14 | 22684139279519345808802725789494254587951810 |