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 | 6 |
| 2 | 55 |
| 3 | 66 |
| 4 | 595 |
| 5 | 666 |
| 6 | 5565 |
| 7 | 5995 |
| 8 | 6555 |
| 9 | 5656566 |
| 10 | 95696695 |
| 11 | 95969966995 |
| 12 | 956996695656 |
| 13 | 6559566959595 |
| 14 | 59999565655666 |
| 15 | 66555666699966 |
| 16 | 555665666566566 |
| 17 | 5566956999995566 |
| 18 | 9956596655559555 |
| 19 | 5555666996669965995 |
| 20 | 5555555666655656666556566566566 |
| 21 | 55659569595955595555595595599656656 |