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 | 11 |
| 3 | 39 |
| 4 | 195 |
| 5 | 849 |
| 6 | 3895 |
| 7 | 17511 |
| 8 | 79339 |
| 9 | 358397 |
| 10 | 1620843 |
| 11 | 7326991 |
| 12 | 33127155 |
| 13 | 149766353 |
| 14 | 677103839 |
| 15 | 3061202815 |
| 16 | 13839823275 |
| 17 | 62570318397 |
| 18 | 282882722979 |
| 19 | 1278922980071 |
| 20 | 5782057329219 |
| 21 | 26140890761969 |
| 22 | 118183916056327 |
| 23 | 534313772133687 |
| 24 | 2415651952691819 |