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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 3 |
| 6 | 4 |
| 7 | 15 |
| 8 | 30 |
| 9 | 42 |
| 10 | 99 |
| 11 | 255 |
| 12 | 475 |
| 13 | 915 |
| 14 | 2232 |
| 15 | 4977 |
| 16 | 9945 |
| 17 | 21945 |
| 18 | 51093 |
| 19 | 110634 |
| 20 | 238005 |
| 21 | 542341 |
| 22 | 1227390 |
| 23 | 2696841 |
| 24 | 6035886 |
| 25 | 13770402 |
| 26 | 31001133 |
| 27 | 69485295 |
| 28 | 157945293 |
| 29 | 359888373 |
| 30 | 814699002 |
| 31 | 1850816823 |
| 32 | 4231092060 |
| 33 | 9659302380 |
| 34 | 22028018679 |