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 | 10 |
| 2 | 38 |
| 3 | 108 |
| 4 | 270 |
| 5 | 632 |
| 6 | 1426 |
| 7 | 3148 |
| 8 | 6854 |
| 9 | 14784 |
| 10 | 31674 |
| 11 | 67508 |
| 12 | 143278 |
| 13 | 303016 |
| 14 | 638882 |
| 15 | 1343388 |
| 16 | 2817942 |
| 17 | 5898128 |
| 18 | 12320650 |
| 19 | 25689988 |
| 20 | 53477246 |
| 21 | 111148920 |
| 22 | 230686578 |
| 23 | 478150508 |
| 24 | 989855590 |
| 25 | 2046820192 |
| 26 | 4227858266 |
| 27 | 8724152148 |
| 28 | 17985175374 |
| 29 | 37044092744 |