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 | 27 |
| 2 | 315 |
| 3 | 1638 |
| 4 | 5670 |
| 5 | 15345 |
| 6 | 35217 |
| 7 | 71820 |
| 8 | 134028 |
| 9 | 233415 |
| 10 | 384615 |
| 11 | 605682 |
| 12 | 918450 |
| 13 | 1348893 |
| 14 | 1927485 |
| 15 | 2689560 |
| 16 | 3675672 |
| 17 | 4931955 |
| 18 | 6510483 |
| 19 | 8469630 |
| 20 | 10874430 |
| 21 | 13796937 |
| 22 | 17316585 |
| 23 | 21520548 |
| 24 | 26504100 |
| 25 | 32370975 |
| 26 | 39233727 |
| 27 | 47214090 |
| 28 | 56443338 |
| 29 | 67062645 |
| 30 | 79223445 |