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 | 3 |
| 1 | 8 |
| 2 | 21 |
| 3 | 56 |
| 4 | 148 |
| 5 | 394 |
| 6 | 1044 |
| 7 | 2776 |
| 8 | 7364 |
| 9 | 19568 |
| 10 | 51936 |
| 11 | 137960 |
| 12 | 366256 |
| 13 | 972736 |
| 14 | 2582736 |
| 15 | 6858880 |
| 16 | 18212288 |
| 17 | 48363680 |
| 18 | 128423232 |
| 19 | 341027456 |
| 20 | 905565760 |
| 21 | 2404701952 |
| 22 | 6385502208 |
| 23 | 16956417664 |
| 24 | 45026632448 |
| 25 | 119565922304 |
| 26 | 317499868416 |
| 27 | 843103631360 |
| 28 | 2238811202560 |
| 29 | 5945037720064 |
| 30 | 15786698462208 |
| 31 | 41920680589312 |
| 32 | 111317928707072 |