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) |
|---|---|
| 1 | 10 |
| 2 | 40 |
| 3 | 108 |
| 4 | 266 |
| 5 | 580 |
| 6 | 1214 |
| 7 | 2420 |
| 8 | 4702 |
| 9 | 8926 |
| 10 | 16680 |
| 11 | 30766 |
| 12 | 56180 |
| 13 | 101734 |
| 14 | 182956 |
| 15 | 327080 |
| 16 | 581742 |
| 17 | 1030000 |
| 18 | 1816290 |
| 19 | 3191136 |
| 20 | 5588050 |
| 21 | 9755530 |
| 22 | 16983260 |
| 23 | 29489098 |