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 | 6 |
| 3 | 39 |
| 4 | 324 |
| 5 | 3365 |
| 6 | 41958 |
| 7 | 610351 |
| 8 | 10146888 |
| 9 | 189775017 |
| 10 | 3943689930 |
| 11 | 90148635203 |
| 12 | 2248040395692 |
| 13 | 60731103481789 |
| 14 | 1766863166037102 |
| 15 | 55075428554246295 |
| 16 | 1831224444159278736 |
| 17 | 64692540643308320081 |
| 18 | 2419861007021854813074 |
| 19 | 95544948688075940395627 |