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) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 6 |
| 3 | 232 |
| 4 | 44 |
| 5 | 636 |
| 6 | 66 |
| 7 | 484 |
| 8 | 888 |
| 9 | 616 |
| 10 | 2442 |
| 11 | 2112 |
| 12 | 4224 |
| 13 | 6006 |
| 14 | 2772 |
| 15 | 26862 |
| 16 | 23232 |
| 17 | 232232 |
| 18 | 46464 |
| 19 | 297792 |
| 20 | 66066 |
| 21 | 88088 |
| 22 | 222222 |
| 23 | 252252 |
| 24 | 213312 |
| 25 | 21122112 |
| 26 | 234432 |
| 27 | 606606 |
| 28 | 828828 |
| 29 | 444444 |
| 30 | 279972 |
| 31 | 21211212 |
| 32 | 666666 |
| 33 | 2444442 |
| 34 | 2114112 |
| 35 | 2578752 |
| 36 | 888888 |
| 37 | 4228224 |
| 38 | 42422424 |
| 39 | 23555532 |
| 40 | 54999945 |
| 41 | 82711728 |