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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 18 |
| 7 | 43 |
| 8 | 102 |
| 9 | 251 |
| 10 | 625 |
| 11 | 1584 |
| 12 | 4055 |
| 13 | 10509 |
| 14 | 27451 |
| 15 | 72307 |
| 16 | 191697 |
| 17 | 511335 |
| 18 | 1370995 |
| 19 | 3693452 |
| 20 | 9991671 |
| 21 | 27133149 |
| 22 | 73934800 |
| 23 | 202096673 |
| 24 | 553999573 |
| 25 | 1522651908 |
| 26 | 4195087022 |
| 27 | 11583820212 |
| 28 | 32052475655 |
| 29 | 88860186023 |