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 | 3 |
| 5 | 4 |
| 6 | 5 |
| 7 | 6 |
| 8 | 7 |
| 9 | 8 |
| 10 | 9 |
| 11 | 11 |
| 12 | 22 |
| 13 | 33 |
| 14 | 111 |
| 15 | 222 |
| 16 | 333 |
| 17 | 444 |
| 18 | 555 |
| 19 | 666 |
| 20 | 777 |
| 21 | 888 |
| 22 | 999 |
| 23 | 1221 |
| 24 | 1441 |
| 25 | 2882 |
| 26 | 5115 |
| 27 | 12321 |
| 28 | 16861 |
| 29 | 19491 |
| 30 | 21112 |
| 31 | 30803 |
| 32 | 33433 |
| 33 | 36063 |
| 34 | 37973 |
| 35 | 42224 |
| 36 | 159951 |
| 37 | 741147 |
| 38 | 987789 |
| 39 | 1301031 |
| 40 | 1867681 |
| 41 | 3315133 |
| 42 | 4306034 |
| 43 | 5182815 |
| 44 | 5927295 |
| 45 | 6918196 |
| 46 | 6950596 |
| 47 | 9242429 |
| 48 | 9488849 |
| 49 | 10066001 |
| 50 | 48655684 |