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 | 7 |
| 2 | 58 |
| 3 | 532 |
| 4 | 5128 |
| 5 | 50512 |
| 6 | 502048 |
| 7 | 5008192 |
| 8 | 50032768 |
| 9 | 500131072 |
| 10 | 5000524288 |
| 11 | 50002097152 |
| 12 | 500008388608 |
| 13 | 5000033554432 |
| 14 | 50000134217728 |
| 15 | 500000536870912 |
| 16 | 5000002147483648 |
| 17 | 50000008589934592 |
| 18 | 500000034359738368 |