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 | 15 |
| 2 | 225 |
| 3 | 1071 |
| 4 | 3321 |
| 5 | 8151 |
| 6 | 17225 |
| 7 | 32775 |
| 8 | 57681 |
| 9 | 95551 |
| 10 | 150801 |
| 11 | 228735 |
| 12 | 335625 |
| 13 | 478791 |
| 14 | 666681 |
| 15 | 908951 |
| 16 | 1216545 |
| 17 | 1601775 |
| 18 | 2078401 |
| 19 | 2661711 |
| 20 | 3368601 |
| 21 | 4217655 |
| 22 | 5229225 |
| 23 | 6425511 |
| 24 | 7830641 |
| 25 | 9470751 |
| 26 | 11374065 |
| 27 | 13570975 |
| 28 | 16094121 |
| 29 | 18978471 |