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) |
|---|---|
| 4 | 186 |
| 5 | 3050 |
| 6 | 20790 |
| 7 | 93030 |
| 8 | 321580 |
| 9 | 930636 |
| 10 | 2362500 |
| 11 | 5420580 |
| 12 | 11473110 |
| 13 | 22732710 |
| 14 | 42628586 |
| 15 | 76289850 |
| 16 | 131160120 |
| 17 | 217765240 |
| 18 | 350657640 |
| 19 | 549562536 |
| 20 | 840752850 |
| 21 | 1258681410 |
| 22 | 1847900670 |
| 23 | 2665301870 |
| 24 | 3782707236 |
| 25 | 5289850500 |
| 26 | 7297782700 |
| 27 | 9942741900 |
| 28 | 13390527150 |