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) |
|---|---|
| 12 | 1 |
| 13 | 11 |
| 14 | 96 |
| 15 | 672 |
| 16 | 3980 |
| 17 | 20503 |
| 18 | 93975 |
| 19 | 389453 |
| 20 | 1478299 |
| 21 | 5192488 |
| 22 | 17020341 |
| 23 | 52432182 |
| 24 | 152709107 |
| 25 | 422668071 |
| 26 | 1116703046 |
| 27 | 2827302880 |
| 28 | 6883265229 |
| 29 | 16163108315 |
| 30 | 36706208439 |
| 31 | 80814659013 |
| 32 | 172870609803 |
| 33 | 359984372056 |