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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 18 |
| 7 | 42 |
| 8 | 108 |
| 9 | 282 |
| 10 | 786 |
| 11 | 2192 |
| 12 | 6402 |
| 13 | 18600 |
| 14 | 55978 |
| 15 | 167256 |
| 16 | 514102 |
| 17 | 1567976 |
| 18 | 4896164 |
| 19 | 15170630 |
| 20 | 47957260 |
| 21 | 150468678 |
| 22 | 480371736 |
| 23 | 1522649458 |
| 24 | 4900568718 |
| 25 | 15665593150 |
| 26 | 50761432998 |
| 27 | 163431901126 |
| 28 | 532624603680 |
| 29 | 1725349278270 |
| 30 | 5650796083020 |
| 31 | 18401781369182 |