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 | 6 |
| 3 | 33 |
| 4 | 132 |
| 5 | 435 |
| 6 | 1466 |
| 7 | 5341 |
| 8 | 18656 |
| 9 | 58029 |
| 10 | 159430 |
| 11 | 392601 |
| 12 | 882036 |
| 13 | 1836159 |
| 14 | 3586506 |
| 15 | 6638885 |
| 16 | 11738656 |
| 17 | 19952441 |
| 18 | 32768742 |
| 19 | 52220113 |
| 20 | 81029700 |
| 21 | 122785131 |
| 22 | 182142906 |
| 23 | 265066605 |
| 24 | 379102400 |
| 25 | 533695525 |
| 26 | 740551526 |
| 27 | 1014046281 |
| 28 | 1371688948 |
| 29 | 1834642167 |
| 30 | 2428304010 |