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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 20 |
| 5 | 24 |
| 6 | 54 |
| 7 | 60 |
| 8 | 61 |
| 9 | 62 |
| 10 | 72 |
| 11 | 73 |
| 12 | 74 |
| 13 | 504 |
| 14 | 510 |
| 15 | 511 |
| 16 | 512 |
| 17 | 560 |
| 18 | 564 |
| 19 | 1512 |
| 20 | 1513 |
| 21 | 1514 |
| 22 | 1520 |
| 23 | 1620 |
| 24 | 1621 |
| 25 | 1622 |
| 26 | 6320 |
| 27 | 6324 |
| 28 | 6372 |
| 29 | 6373 |
| 30 | 6374 |
| 31 | 6500 |
| 32 | 6504 |
| 33 | 6552 |
| 34 | 6553 |
| 35 | 6554 |
| 36 | 6560 |
| 37 | 13122 |
| 38 | 13123 |
| 39 | 13124 |
| 40 | 13770 |
| 41 | 13771 |
| 42 | 13772 |
| 43 | 13824 |
| 44 | 13850 |
| 45 | 15072 |
| 46 | 15073 |
| 47 | 15074 |