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 | 0 |
| 2 | 1 |
| 3 | 19 |
| 4 | 1394 |
| 5 | 281990 |
| 6 | 377205809 |
| 7 | 1539951848735 |
| 8 | 44222409563201991 |
| 9 | 3842818845468254120853 |
| 10 | 2396657968905952750257244144 |