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 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 31 |
| 5 | 80 |
| 6 | 196 |
| 7 | 486 |
| 8 | 1171 |
| 9 | 2787 |
| 10 | 6564 |
| 11 | 15323 |
| 12 | 35403 |
| 13 | 81251 |
| 14 | 185087 |
| 15 | 418918 |
| 16 | 942525 |
| 17 | 2109143 |
| 18 | 4695648 |
| 19 | 10405694 |
| 20 | 22959156 |