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 | 5 |
| 2 | 41 |
| 3 | 377 |
| 4 | 3649 |
| 5 | 36365 |
| 6 | 369305 |
| 7 | 3800305 |
| 8 | 39490049 |
| 9 | 413442773 |
| 10 | 4354393801 |
| 11 | 46082942185 |
| 12 | 489658242241 |
| 13 | 5220495115997 |
| 14 | 55818956905529 |
| 15 | 598318746037217 |
| 16 | 6427269150511105 |
| 17 | 69175175263888037 |
| 18 | 745778857519239785 |
| 19 | 8052432236270744665 |
| 20 | 87063177396677721409 |