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 | 21 |
| 3 | 45 |
| 4 | 63 |
| 5 | 105 |
| 6 | 117 |
| 7 | 273 |
| 8 | 285 |
| 9 | 585 |
| 10 | 627 |
| 11 | 765 |
| 12 | 1365 |
| 13 | 1449 |
| 14 | 1677 |
| 15 | 3705 |
| 16 | 3885 |
| 17 | 4221 |
| 18 | 4485 |
| 19 | 4797 |
| 20 | 7137 |
| 21 | 7565 |
| 22 | 8109 |
| 23 | 10197 |
| 24 | 10545 |
| 25 | 11445 |
| 26 | 13065 |
| 27 | 14637 |
| 28 | 16965 |
| 29 | 19437 |
| 30 | 20805 |
| 31 | 26061 |
| 32 | 27645 |
| 33 | 30573 |
| 34 | 31317 |
| 35 | 33705 |
| 36 | 35853 |
| 37 | 38805 |
| 38 | 39897 |
| 39 | 40887 |
| 40 | 41181 |
| 41 | 48633 |
| 42 | 50505 |
| 43 | 57057 |