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 | 9 |
| 2 | 133 |
| 3 | 2283 |
| 4 | 41589 |
| 5 | 782149 |
| 6 | 15007831 |
| 7 | 291987327 |
| 8 | 5738781717 |
| 9 | 113670432141 |
| 10 | 2265365597553 |
| 11 | 45371770152927 |
| 12 | 912463490703879 |
| 13 | 18413786266130979 |
| 14 | 372689501160357787 |
| 15 | 7562267679664012693 |
| 16 | 153785739808245476757 |