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 | 0 |
| 1 | 3 |
| 2 | 10 |
| 3 | 36 |
| 4 | 134 |
| 5 | 510 |
| 6 | 1976 |
| 7 | 7770 |
| 8 | 30934 |
| 9 | 124456 |
| 10 | 505254 |
| 11 | 2067250 |
| 12 | 8516028 |
| 13 | 35292978 |
| 14 | 147045490 |
| 15 | 615572172 |
| 16 | 2587970166 |
| 17 | 10922249958 |
| 18 | 46257477232 |
| 19 | 196532215226 |
| 20 | 837432161710 |
| 21 | 3577882539792 |
| 22 | 15323984114822 |
| 23 | 65781749593002 |
| 24 | 282979540332660 |