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 | 4 |
| 5 | 65 |
| 6 | 566 |
| 7 | 3710 |
| 8 | 20756 |
| 9 | 105299 |
| 10 | 500862 |
| 11 | 2278936 |
| 12 | 10046620 |
| 13 | 43280341 |
| 14 | 183278902 |
| 15 | 766153042 |
| 16 | 3171277460 |
| 17 | 13027450455 |
| 18 | 53203165950 |
| 19 | 216290270892 |
| 20 | 876183166140 |
| 21 | 3539559610905 |
| 22 | 14267986165270 |
| 23 | 57416955957350 |
| 24 | 230750092893524 |
| 25 | 926388737476955 |
| 26 | 3716144413352126 |