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 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 25 |
| 6 | 84 |
| 7 | 323 |
| 8 | 1377 |
| 9 | 6412 |
| 10 | 32312 |
| 11 | 174941 |
| 12 | 1011357 |
| 13 | 6210298 |
| 14 | 40323011 |
| 15 | 275763910 |
| 16 | 1979709852 |
| 17 | 14875239212 |
| 18 | 116679269248 |
| 19 | 953201694216 |
| 20 | 8093501305721 |
| 21 | 71291395351760 |
| 22 | 650357174742217 |
| 23 | 6134966541625355 |
| 24 | 59759476024690454 |
| 25 | 600309156303711764 |