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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 19 |
| 7 | 48 |
| 8 | 126 |
| 9 | 355 |
| 10 | 1037 |
| 11 | 3124 |
| 12 | 9676 |
| 13 | 30604 |
| 14 | 98473 |
| 15 | 321572 |
| 16 | 1063146 |
| 17 | 3552563 |
| 18 | 11982142 |
| 19 | 40746208 |
| 20 | 139573646 |
| 21 | 481232759 |
| 22 | 1669024720 |
| 23 | 5819537836 |
| 24 | 20390462732 |
| 25 | 71762924354 |
| 26 | 253601229046 |
| 27 | 899586777908 |
| 28 | 3202234779826 |
| 29 | 11435967528286 |
| 30 | 40964243249727 |