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 | 3 |
| 4 | 8 |
| 5 | 24 |
| 6 | 65 |
| 7 | 195 |
| 8 | 564 |
| 9 | 1677 |
| 10 | 4976 |
| 11 | 14883 |
| 12 | 44452 |
| 13 | 133224 |
| 14 | 399113 |
| 15 | 1196808 |
| 16 | 3588840 |
| 17 | 10764960 |
| 18 | 32289855 |
| 19 | 96864963 |
| 20 | 290580040 |
| 21 | 871725426 |
| 22 | 2615132465 |
| 23 | 7845353475 |
| 24 | 23535926760 |
| 25 | 70607649816 |
| 26 | 211822550576 |