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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 5 |
| 8 | 13 |
| 9 | 29 |
| 10 | 70 |
| 11 | 165 |
| 12 | 409 |
| 13 | 1001 |
| 14 | 2505 |
| 15 | 6278 |
| 16 | 15904 |
| 17 | 40447 |
| 18 | 103567 |
| 19 | 266229 |
| 20 | 687668 |
| 21 | 1782573 |
| 22 | 4637731 |
| 23 | 12103112 |
| 24 | 31679212 |
| 25 | 83135973 |
| 26 | 218713492 |
| 27 | 576683119 |
| 28 | 1523740365 |
| 29 | 4033915677 |
| 30 | 10698680606 |
| 31 | 28422818782 |
| 32 | 75629586540 |
| 33 | 201539697208 |
| 34 | 537818080714 |