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 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 23 |
| 5 | 75 |
| 6 | 277 |
| 7 | 1132 |
| 8 | 4977 |
| 9 | 22979 |
| 10 | 109451 |
| 11 | 531456 |
| 12 | 2610931 |
| 13 | 12917683 |
| 14 | 64181625 |
| 15 | 319695980 |
| 16 | 1594859885 |
| 17 | 7963472187 |
| 18 | 39784944799 |
| 19 | 198827606704 |
| 20 | 993846943839 |
| 21 | 4968361974491 |
| 22 | 24839192686973 |
| 23 | 124188113975628 |
| 24 | 620917025694793 |
| 25 | 3104514504312595 |
| 26 | 15522360665856147 |
| 27 | 77611167795714752 |