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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 10 |
| 5 | 23 |
| 6 | 50 |
| 7 | 112 |
| 8 | 246 |
| 9 | 545 |
| 10 | 1202 |
| 11 | 2658 |
| 12 | 5870 |
| 13 | 12972 |
| 14 | 28656 |
| 15 | 63315 |
| 16 | 139880 |
| 17 | 309049 |
| 18 | 682790 |
| 19 | 1508527 |
| 20 | 3332850 |
| 21 | 7363430 |
| 22 | 16268356 |
| 23 | 35942447 |
| 24 | 79409300 |
| 25 | 175442668 |
| 26 | 387613604 |
| 27 | 856372740 |
| 28 | 1892023992 |
| 29 | 4180136405 |
| 30 | 9235369230 |