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 | 4 |
| 2 | 26 |
| 3 | 232 |
| 4 | 2657 |
| 5 | 37405 |
| 6 | 627435 |
| 7 | 12248365 |
| 8 | 273211787 |
| 9 | 6862775083 |
| 10 | 191840407156 |
| 11 | 5909873159107 |
| 12 | 199002812894375 |
| 13 | 7273866200397039 |
| 14 | 286882936292798852 |
| 15 | 12145886485652450131 |
| 16 | 549504341899436759416 |