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 | 3 |
| 2 | 9 |
| 3 | 19 |
| 4 | 42 |
| 5 | 78 |
| 6 | 146 |
| 7 | 246 |
| 8 | 420 |
| 9 | 668 |
| 10 | 1068 |
| 11 | 1620 |
| 12 | 2470 |
| 13 | 3618 |
| 14 | 5310 |
| 15 | 7546 |
| 16 | 10746 |
| 17 | 14910 |
| 18 | 20706 |
| 19 | 28134 |
| 20 | 38262 |
| 21 | 51090 |
| 22 | 68238 |
| 23 | 89706 |
| 24 | 117964 |
| 25 | 153012 |
| 26 | 198468 |
| 27 | 254332 |
| 28 | 325914 |
| 29 | 413214 |
| 30 | 523778 |
| 31 | 657606 |
| 32 | 825444 |
| 33 | 1027292 |
| 34 | 1278060 |
| 35 | 1577748 |
| 36 | 1947062 |
| 37 | 2386002 |
| 38 | 2922702 |
| 39 | 3557162 |
| 40 | 4327644 |