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 | 127 |
| 10 | 221 |
| 11 | 396 |
| 12 | 781 |
| 13 | 1716 |
| 14 | 4005 |
| 15 | 9390 |
| 16 | 21421 |
| 17 | 47107 |
| 18 | 100283 |
| 19 | 208982 |
| 20 | 432197 |
| 21 | 898064 |
| 22 | 1889152 |
| 23 | 4028036 |
| 24 | 8671852 |
| 25 | 18739049 |
| 26 | 40434205 |
| 27 | 86861995 |
| 28 | 185669195 |
| 29 | 395358538 |
| 30 | 840341619 |
| 31 | 1786426005 |
| 32 | 3803164340 |
| 33 | 8111872645 |
| 34 | 17329007156 |