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 | 4 |
| 2 | 85 |
| 3 | 3471 |
| 4 | 176893 |
| 5 | 9779558 |
| 6 | 556027700 |
| 7 | 31770135236 |
| 8 | 1805384910990 |
| 9 | 101606391647751 |
| 10 | 5657068092397559 |
| 11 | 311737148953336261 |
| 12 | 17023765723406625834 |
| 13 | 922742812050648219706 |