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 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 6 |
| 8 | 21 |
| 9 | 56 |
| 10 | 126 |
| 11 | 252 |
| 12 | 504 |
| 13 | 924 |
| 14 | 1584 |
| 15 | 2574 |
| 16 | 4004 |
| 17 | 6006 |
| 18 | 9009 |
| 19 | 13104 |
| 20 | 18564 |
| 21 | 25704 |
| 22 | 34884 |
| 23 | 46512 |
| 24 | 62016 |
| 25 | 81396 |
| 26 | 105336 |
| 27 | 134596 |
| 28 | 170016 |
| 29 | 212520 |
| 30 | 265650 |
| 31 | 328900 |
| 32 | 403650 |
| 33 | 491400 |
| 34 | 593775 |
| 35 | 712531 |
| 36 | 855037 |
| 37 | 1019467 |
| 38 | 1208257 |
| 39 | 1424017 |