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 | 9 |
| 2 | 45 |
| 3 | 55 |
| 4 | 99 |
| 5 | 703 |
| 6 | 999 |
| 7 | 4950 |
| 8 | 5050 |
| 9 | 7272 |
| 10 | 7777 |
| 11 | 9999 |
| 12 | 77778 |
| 13 | 82656 |
| 14 | 95121 |
| 15 | 99999 |
| 16 | 318682 |
| 17 | 329967 |
| 18 | 351352 |
| 19 | 356643 |
| 20 | 390313 |
| 21 | 461539 |
| 22 | 466830 |
| 23 | 499500 |
| 24 | 500500 |
| 25 | 533170 |
| 26 | 538461 |
| 27 | 609687 |
| 28 | 643357 |
| 29 | 648648 |
| 30 | 670033 |
| 31 | 681318 |
| 32 | 791505 |
| 33 | 812890 |
| 34 | 818181 |
| 35 | 851851 |
| 36 | 857143 |
| 37 | 961038 |