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 | 61 |
| 2 | 7537 |
| 3 | 41455 |
| 4 | 618531 |
| 5 | 12670589 |
| 6 | 29075821 |
| 7 | 247316941 |
| 8 | 826985881 |
| 9 | 1437223369 |
| 10 | 3989619561 |
| 11 | 15521533197 |
| 12 | 51295084349 |
| 13 | 74158059901 |
| 14 | 207831585787 |
| 15 | 391117136551 |
| 16 | 528866563321 |
| 17 | 1242387913729 |
| 18 | 2113505780927 |
| 19 | 4462952476841 |