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 | 5 |
| 3 | 55 |
| 4 | 505 |
| 5 | 515 |
| 6 | 525 |
| 7 | 535 |
| 8 | 545 |
| 9 | 555 |
| 10 | 565 |
| 11 | 575 |
| 12 | 585 |
| 13 | 595 |
| 14 | 5005 |
| 15 | 5115 |
| 16 | 5225 |
| 17 | 5335 |
| 18 | 5445 |
| 19 | 5555 |
| 20 | 5665 |
| 21 | 5775 |
| 22 | 5885 |
| 23 | 5995 |
| 24 | 50005 |
| 25 | 50105 |
| 26 | 50205 |
| 27 | 50305 |
| 28 | 50405 |
| 29 | 50505 |
| 30 | 50605 |
| 31 | 50705 |
| 32 | 50805 |
| 33 | 50905 |
| 34 | 51015 |
| 35 | 51115 |
| 36 | 51215 |
| 37 | 51315 |
| 38 | 51415 |
| 39 | 51515 |
| 40 | 51615 |
| 41 | 51715 |
| 42 | 51815 |
| 43 | 51915 |