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) |
|---|---|
| 1 | 16 |
| 2 | 21 |
| 3 | 58 |
| 4 | 153 |
| 5 | 445 |
| 6 | 1595 |
| 7 | 4772 |
| 8 | 15249 |
| 9 | 49634 |
| 10 | 166329 |
| 11 | 547264 |
| 12 | 1812790 |
| 13 | 6026255 |
| 14 | 20329381 |
| 15 | 68337634 |
| 16 | 228989976 |
| 17 | 768581607 |
| 18 | 2595937574 |
| 19 | 8761489896 |
| 20 | 29487968631 |
| 21 | 99305798186 |
| 22 | 335393857959 |
| 23 | 1132559861889 |
| 24 | 3818247323820 |
| 25 | 12874857356305 |