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 | 3 |
| 1 | 1 |
| 2 | -1 |
| 3 | 3 |
| 4 | 19 |
| 5 | 53 |
| 6 | 111 |
| 7 | 199 |
| 8 | 323 |
| 9 | 489 |
| 10 | 703 |
| 11 | 971 |
| 12 | 1299 |
| 13 | 1693 |
| 14 | 2159 |
| 15 | 2703 |
| 16 | 3331 |
| 17 | 4049 |
| 18 | 4863 |
| 19 | 5779 |
| 20 | 6803 |
| 21 | 7941 |
| 22 | 9199 |
| 23 | 10583 |
| 24 | 12099 |
| 25 | 13753 |
| 26 | 15551 |
| 27 | 17499 |
| 28 | 19603 |
| 29 | 21869 |
| 30 | 24303 |
| 31 | 26911 |
| 32 | 29699 |
| 33 | 32673 |
| 34 | 35839 |
| 35 | 39203 |
| 36 | 42771 |
| 37 | 46549 |
| 38 | 50543 |
| 39 | 54759 |
| 40 | 59203 |