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 | 0 |
| 1 | 1 |
| 2 | 0 |
| 3 | 3 |
| 4 | 0 |
| 5 | 10 |
| 6 | 1 |
| 7 | 35 |
| 8 | 9 |
| 9 | 126 |
| 10 | 55 |
| 11 | 462 |
| 12 | 286 |
| 13 | 1717 |
| 14 | 1365 |
| 15 | 6451 |
| 16 | 6188 |
| 17 | 24463 |
| 18 | 27132 |
| 19 | 93518 |
| 20 | 116281 |
| 21 | 360031 |
| 22 | 490337 |
| 23 | 1394582 |
| 24 | 2043275 |
| 25 | 5430530 |
| 26 | 8439210 |
| 27 | 21242341 |
| 28 | 34621041 |
| 29 | 83411715 |
| 30 | 141290436 |
| 31 | 328589491 |
| 32 | 574274008 |
| 33 | 1297937234 |
| 34 | 2326683921 |