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 | 3 |
| 2 | 24 |
| 3 | 190 |
| 4 | 1659 |
| 5 | 15309 |
| 6 | 146986 |
| 7 | 1453536 |
| 8 | 14704917 |
| 9 | 151479031 |
| 10 | 1583533308 |
| 11 | 16756882194 |
| 12 | 179149227231 |
| 13 | 1932144798513 |
| 14 | 20996553430206 |
| 15 | 229678298803028 |
| 16 | 2527034248221849 |
| 17 | 27947027713469307 |
| 18 | 310494250880357488 |
| 19 | 3463870813896354726 |
| 20 | 38787008808135775299 |