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 | 18 |
| 7 | 233 |
| 8 | 1449 |
| 9 | 6213 |
| 10 | 20993 |
| 11 | 59943 |
| 12 | 150903 |
| 13 | 344323 |
| 14 | 726033 |
| 15 | 1434678 |
| 16 | 2685046 |
| 17 | 4798206 |
| 18 | 8240022 |
| 19 | 13669026 |
| 20 | 21995586 |
| 21 | 34453386 |
| 22 | 52685556 |
| 23 | 78846471 |
| 24 | 115721991 |
| 25 | 166869131 |
| 26 | 236778399 |
| 27 | 331059729 |
| 28 | 456655745 |
| 29 | 622083189 |
| 30 | 837706779 |