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 | 9 |
| 3 | 241 |
| 4 | 15177 |
| 5 | 1871761 |
| 6 | 400086249 |
| 7 | 136109095921 |
| 8 | 69234116652297 |
| 9 | 50204612238691921 |
| 10 | 49984961118827342889 |
| 11 | 66285608345755685396401 |
| 12 | 114183585213704219683871817 |
| 13 | 250186610841184605935378238481 |
| 14 | 684906688327788169186039802989929 |
| 15 | 2306818395080969813211747978667981681 |