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 | 0 |
| 1 | 3 |
| 2 | 72 |
| 3 | 729 |
| 4 | 5184 |
| 5 | 30375 |
| 6 | 157464 |
| 7 | 750141 |
| 8 | 3359232 |
| 9 | 14348907 |
| 10 | 59049000 |
| 11 | 235782657 |
| 12 | 918330048 |
| 13 | 3502727631 |
| 14 | 13124466936 |
| 15 | 48427561125 |
| 16 | 176319369216 |
| 17 | 634465620819 |
| 18 | 2259436291848 |
| 19 | 7971951402153 |
| 20 | 27894275208000 |
| 21 | 96873331012983 |
| 22 | 334145522716632 |
| 23 | 1145440056788109 |
| 24 | 3904305912313344 |