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) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 30 |
| 7 | 74 |
| 8 | 188 |
| 9 | 478 |
| 10 | 1235 |
| 11 | 3214 |
| 12 | 8450 |
| 13 | 22370 |
| 14 | 59676 |
| 15 | 160140 |
| 16 | 432237 |
| 17 | 1172436 |
| 18 | 3194870 |
| 19 | 8741442 |
| 20 | 24007045 |
| 21 | 66154654 |
| 22 | 182864692 |
| 23 | 506909562 |
| 24 | 1408854940 |
| 25 | 3925075510 |
| 26 | 10959698606 |
| 27 | 30665337738 |
| 28 | 85967279447 |
| 29 | 241433975446 |
| 30 | 679192039401 |
| 31 | 1913681367936 |
| 32 | 5399924120339 |