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) |
|---|---|
| 2 | 16 |
| 3 | 144 |
| 4 | 3888 |
| 5 | 55566 |
| 6 | 255552 |
| 7 | 1111222 |
| 8 | 76776777 |
| 9 | 799779977 |
| 10 | 4334433444 |
| 11 | 61161166611 |
| 12 | 292229292292 |
| 13 | 1122121111111 |
| 14 | 55115551555155 |
| 15 | 799777779779979 |
| 16 | 1161111111166611 |
| 17 | 11112112121222112 |
| 18 | 111111222221111112 |
| 19 | 3334334333334333333 |
| 20 | 55333333335335355355 |
| 21 | 222229999999292992929 |
| 22 | 3383383883833883388888 |
| 23 | 11112221111212222222221 |
| 24 | 112122222222122122122112 |
| 25 | 2777227772777277722272272 |
| 26 | 61666616611611166166161116 |
| 27 | 858885585585555585558558858 |
| 28 | 3331333133331111313111133133 |
| 29 | 98888999899889989898999889999 |
| 30 | 111661111111666616661166166616 |