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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 9 |
| 6 | 28 |
| 7 | 81 |
| 8 | 136 |
| 9 | 1216 |
| 10 | 6561 |
| 11 | 16768 |
| 12 | 29889 |
| 13 | 76545 |
| 14 | 203392 |
| 15 | 636417 |
| 16 | 1043200 |
| 17 | 3995649 |
| 18 | 6082048 |
| 19 | 24151041 |
| 20 | 36315136 |
| 21 | 326481921 |
| 22 | 689278977 |
| 23 | 1487503360 |
| 24 | 11573190657 |
| 25 | 76876660737 |
| 26 | 155240824833 |
| 27 | 314944159744 |
| 28 | 785129144320 |
| 29 | 2035980763137 |
| 30 | 4857090670593 |