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 | 9 |
| 2 | 144 |
| 3 | 1089 |
| 4 | 5184 |
| 5 | 18225 |
| 6 | 51984 |
| 7 | 127449 |
| 8 | 278784 |
| 9 | 558009 |
| 10 | 1040400 |
| 11 | 1830609 |
| 12 | 3069504 |
| 13 | 4941729 |
| 14 | 7683984 |
| 15 | 11594025 |
| 16 | 17040384 |
| 17 | 24472809 |
| 18 | 34433424 |
| 19 | 47568609 |
| 20 | 64641600 |
| 21 | 86545809 |
| 22 | 114318864 |
| 23 | 149157369 |
| 24 | 192432384 |
| 25 | 245705625 |
| 26 | 310746384 |
| 27 | 389549169 |
| 28 | 484352064 |
| 29 | 597655809 |
| 30 | 732243600 |