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 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 41 |
| 5 | 196 |
| 6 | 1057 |
| 7 | 6322 |
| 8 | 41393 |
| 9 | 293608 |
| 10 | 2237921 |
| 11 | 18210094 |
| 12 | 157329097 |
| 13 | 1436630092 |
| 14 | 13810863809 |
| 15 | 139305550066 |
| 16 | 1469959371233 |
| 17 | 16184586405328 |
| 18 | 185504221191745 |
| 19 | 2208841954063318 |
| 20 | 27272621155678841 |
| 21 | 348586218389733556 |
| 22 | 4605223387997411873 |