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 | 34 |
| 2 | 23409 |
| 3 | 6895792 |
| 4 | 2573281769 |
| 5 | 901990734650 |
| 6 | 322462050747008 |
| 7 | 114725843769441312 |
| 8 | 40891433857372174697 |
| 9 | 14569902220123180849570 |
| 10 | 5192364005728133102693809 |
| 11 | 1850411178640946683018130720 |
| 12 | 659450907727206885142090933473 |
| 13 | 235016288414744436265662641403648 |