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) |
|---|---|
| 3 | 36 |
| 4 | 240 |
| 5 | 780 |
| 6 | 2952 |
| 7 | 10164 |
| 8 | 35040 |
| 9 | 118044 |
| 10 | 393720 |
| 11 | 1299012 |
| 12 | 4251600 |
| 13 | 13817388 |
| 14 | 44641128 |
| 15 | 143488980 |
| 16 | 459165120 |
| 17 | 1463588412 |
| 18 | 4649045976 |
| 19 | 14721978468 |
| 20 | 46490458800 |
| 21 | 146444944716 |
| 22 | 460255541064 |
| 23 | 1443528741876 |
| 24 | 4518872583840 |
| 25 | 14121476823900 |
| 26 | 44059007691192 |