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 | 0 |
| 1 | 5 |
| 2 | 51 |
| 3 | 507 |
| 4 | 5047 |
| 5 | 50144 |
| 6 | 500265 |
| 7 | 5000421 |
| 8 | 50001942 |
| 9 | 500012608 |
| 10 | 5000058013 |
| 11 | 50000171112 |
| 12 | 500000261313 |
| 13 | 5000000483289 |