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) |
|---|---|
| 7 | 1 |
| 8 | 4 |
| 9 | 23 |
| 10 | 104 |
| 11 | 510 |
| 12 | 2411 |
| 13 | 11661 |
| 14 | 57226 |
| 15 | 283833 |
| 16 | 1434373 |
| 17 | 7346663 |
| 18 | 38317226 |
| 19 | 202773341 |
| 20 | 1091360787 |
| 21 | 5961577175 |
| 22 | 33093602158 |
| 23 | 186413366123 |
| 24 | 1066200757106 |
| 25 | 6185213644077 |
| 26 | 36404110664402 |
| 27 | 217206981954701 |
| 28 | 1313899575466329 |
| 29 | 8052745347023754 |
| 30 | 50003529679287381 |