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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 11 |
| 5 | 143 |
| 6 | 1847 |
| 7 | 24127 |
| 8 | 2101931 |
| 9 | 96398196 |
| 10 | 9362963203 |
| 11 | 3376252046640 |
| 12 | 551993132054154 |
| 13 | 434634824535802596 |
| 14 | 528116646162507517308 |
| 15 | 372831439174848001477184 |
| 16 | 2029862948426766042724907818 |