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 | 55 |
| 2 | 595 |
| 3 | 5995 |
| 4 | 255255 |
| 5 | 292995 |
| 6 | 299925 |
| 7 | 25952229225 |
| 8 | 99292929555225 |
| 9 | 55955525255559595 |
| 10 | 555959229929999252295 |
| 11 | 925952955522559552259925 |
| 12 | 5299552922255552929595999295 |
| 13 | 5995959559225555222929295255522595295 |
| 14 | 9925559955529295222599225259529552225 |