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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 65 |
| 6 | 209 |
| 7 | 714 |
| 8 | 7314 |
| 9 | 38570 |
| 10 | 254540 |
| 11 | 728364 |
| 12 | 11243154 |
| 13 | 58524465 |
| 14 | 812646120 |
| 15 | 5163068910 |
| 16 | 58720148850 |
| 17 | 555409903685 |
| 18 | 4339149420605 |
| 19 | 69322940121435 |
| 20 | 490005293940084 |
| 21 | 5819629108725509 |
| 22 | 76622240600506314 |