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 | 4 |
| 3 | 9 |
| 4 | 23 |
| 5 | 63 |
| 6 | 176 |
| 7 | 491 |
| 8 | 1362 |
| 9 | 3762 |
| 10 | 10369 |
| 11 | 28559 |
| 12 | 78653 |
| 13 | 216638 |
| 14 | 596761 |
| 15 | 1643966 |
| 16 | 4528932 |
| 17 | 12476737 |
| 18 | 34372059 |
| 19 | 94691059 |
| 20 | 260862508 |
| 21 | 718644363 |
| 22 | 1979777046 |
| 23 | 5454042866 |
| 24 | 15025219777 |
| 25 | 41392641187 |
| 26 | 114031662049 |
| 27 | 314143279634 |
| 28 | 865426307713 |
| 29 | 2384143611738 |
| 30 | 6568023995156 |