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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 55 |
| 6 | 66 |
| 7 | 171 |
| 8 | 595 |
| 9 | 666 |
| 10 | 3003 |
| 11 | 5995 |
| 12 | 8778 |
| 13 | 15051 |
| 14 | 66066 |
| 15 | 617716 |
| 16 | 828828 |
| 17 | 1269621 |
| 18 | 1680861 |
| 19 | 3544453 |
| 20 | 5073705 |
| 21 | 5676765 |
| 22 | 6295926 |
| 23 | 35133153 |
| 24 | 61477416 |
| 25 | 178727871 |
| 26 | 1264114621 |
| 27 | 1634004361 |
| 28 | 5289009825 |
| 29 | 6172882716 |
| 30 | 13953435931 |