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 | 31 |
| 2 | 2521 |
| 3 | 97921 |
| 4 | 4974481 |
| 5 | 226965751 |
| 6 | 10783342081 |
| 7 | 504420084871 |
| 8 | 23735900452321 |
| 9 | 1114384154071681 |
| 10 | 52364857850613001 |
| 11 | 2459808940392975631 |
| 12 | 115562692701892638721 |
| 13 | 5428914300540041959471 |
| 14 | 255044709450472227347881 |