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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 26 |
| 6 | 73 |
| 7 | 214 |
| 8 | 651 |
| 9 | 2040 |
| 10 | 6549 |
| 11 | 21453 |
| 12 | 71485 |
| 13 | 241702 |
| 14 | 827603 |
| 15 | 2865087 |
| 16 | 10014927 |
| 17 | 35307628 |
| 18 | 125427569 |
| 19 | 448616693 |
| 20 | 1614432373 |
| 21 | 5842129120 |
| 22 | 21247505098 |
| 23 | 77631329535 |
| 24 | 284832049361 |
| 25 | 1049092809734 |
| 26 | 3877749157355 |
| 27 | 14380314221305 |
| 28 | 53490244751332 |