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 | 2 |
| 3 | 3 |
| 4 | 10 |
| 5 | 15 |
| 6 | 56 |
| 7 | 210 |
| 8 | 330 |
| 9 | 1287 |
| 10 | 2002 |
| 11 | 8008 |
| 12 | 31824 |
| 13 | 50388 |
| 14 | 203490 |
| 15 | 319770 |
| 16 | 1307504 |
| 17 | 2042975 |
| 18 | 8436285 |
| 19 | 34597290 |
| 20 | 54627300 |
| 21 | 225792840 |
| 22 | 354817320 |
| 23 | 1476337800 |
| 24 | 6107086800 |
| 25 | 9669554100 |
| 26 | 40225345056 |
| 27 | 63432274896 |
| 28 | 265182149218 |
| 29 | 416714805914 |
| 30 | 1749695026860 |