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 | 21 |
| 2 | 26 |
| 3 | 65 |
| 4 | 250 |
| 5 | 541 |
| 6 | 1225 |
| 7 | 2583 |
| 8 | 5488 |
| 9 | 11899 |
| 10 | 25570 |
| 11 | 54750 |
| 12 | 117697 |
| 13 | 252985 |
| 14 | 543115 |
| 15 | 1166472 |
| 16 | 2505919 |
| 17 | 5382274 |
| 18 | 11560042 |
| 19 | 24830445 |
| 20 | 53333641 |
| 21 | 114554095 |
| 22 | 246050920 |
| 23 | 528494067 |
| 24 | 1135150426 |
| 25 | 2438187262 |
| 26 | 5236983073 |
| 27 | 11248510665 |
| 28 | 24160660963 |