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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 5 |
| 6 | 15 |
| 7 | 35 |
| 8 | 70 |
| 9 | 126 |
| 10 | 211 |
| 11 | 342 |
| 12 | 573 |
| 13 | 1079 |
| 14 | 2366 |
| 15 | 5733 |
| 16 | 14197 |
| 17 | 34223 |
| 18 | 78832 |
| 19 | 173166 |
| 20 | 364876 |
| 21 | 745066 |
| 22 | 1493990 |
| 23 | 2985725 |
| 24 | 6030652 |
| 25 | 12428911 |
| 26 | 26199706 |
| 27 | 56231526 |
| 28 | 121847272 |
| 29 | 264270015 |
| 30 | 570020037 |
| 31 | 1218672066 |
| 32 | 2581172411 |
| 33 | 5424947523 |
| 34 | 11347651254 |