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) |
|---|---|
| 0 | 81 |
| 1 | 108 |
| 2 | 216 |
| 3 | 540 |
| 4 | 1188 |
| 5 | 2484 |
| 6 | 5076 |
| 7 | 10260 |
| 8 | 23112 |
| 9 | 57996 |
| 10 | 135648 |
| 11 | 475632 |
| 12 | 1586736 |
| 13 | 4760640 |
| 14 | 20409408 |
| 15 | 89259840 |
| 16 | 374899968 |
| 17 | 1880140032 |
| 18 | 9400707072 |
| 19 | 64402394112 |
| 20 | 395614900224 |
| 21 | 2769304412160 |
| 22 | 22930714939392 |
| 23 | 162970999640064 |
| 24 | 1188480788434944 |
| 25 | 8320496444780544 |