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) |
|---|---|
| 10 | 1 |
| 11 | 30 |
| 12 | 465 |
| 13 | 4990 |
| 14 | 41820 |
| 15 | 292296 |
| 16 | 1775075 |
| 17 | 9629800 |
| 18 | 47604225 |
| 19 | 217630430 |
| 20 | 930607321 |
| 21 | 3755443890 |
| 22 | 14405010340 |
| 23 | 52827550470 |
| 24 | 186123730845 |
| 25 | 632552752322 |
| 26 | 2080824994210 |
| 27 | 6644958372540 |
| 28 | 20652164516930 |
| 29 | 62605166996300 |
| 30 | 185464736482827 |
| 31 | 537841680016510 |
| 32 | 1529116657680575 |