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 | 13 |
| 2 | 778 |
| 3 | 104149 |
| 4 | 25053583 |
| 5 | 9566642254 |
| 6 | 5355754528213 |
| 7 | 4158610032552331 |
| 8 | 4298349730542075004 |
| 9 | 5729540573235706713253 |
| 10 | 9603970716624058765049701 |
| 11 | 19831898899231255981742972188 |
| 12 | 49594487447520772034033468182501 |