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 | 21 |
| 2 | 57 |
| 3 | 133 |
| 4 | 381 |
| 5 | 553 |
| 6 | 813 |
| 7 | 993 |
| 8 | 1057 |
| 9 | 1333 |
| 10 | 1561 |
| 11 | 1641 |
| 12 | 1893 |
| 13 | 1981 |
| 14 | 2653 |
| 15 | 2757 |
| 16 | 3193 |
| 17 | 3661 |
| 18 | 5257 |
| 19 | 5853 |
| 20 | 6973 |
| 21 | 8373 |
| 22 | 8557 |
| 23 | 9121 |
| 24 | 9313 |
| 25 | 10713 |
| 26 | 10921 |
| 27 | 12657 |
| 28 | 13341 |
| 29 | 15253 |
| 30 | 15501 |
| 31 | 16257 |
| 32 | 18633 |
| 33 | 19741 |
| 34 | 22053 |
| 35 | 24493 |
| 36 | 29413 |
| 37 | 30801 |
| 38 | 32221 |
| 39 | 32581 |
| 40 | 33673 |
| 41 | 35157 |
| 42 | 39801 |