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 | 4 |
| 2 | 22 |
| 3 | 110 |
| 4 | 453 |
| 5 | 1482 |
| 6 | 4083 |
| 7 | 9926 |
| 8 | 21959 |
| 9 | 45122 |
| 10 | 87347 |
| 11 | 160922 |
| 12 | 284310 |
| 13 | 484528 |
| 14 | 800206 |
| 15 | 1285462 |
| 16 | 2014746 |
| 17 | 3088824 |
| 18 | 4642092 |
| 19 | 6851430 |
| 20 | 9946827 |
| 21 | 14224030 |
| 22 | 20059493 |
| 23 | 27927926 |
| 24 | 38422769 |
| 25 | 52279942 |
| 26 | 70405249 |
| 27 | 93905842 |
| 28 | 124126180 |