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 | 89 |
| 3 | 98 |
| 4 | 99 |
| 5 | 799 |
| 6 | 889 |
| 7 | 898 |
| 8 | 899 |
| 9 | 979 |
| 10 | 988 |
| 11 | 989 |
| 12 | 997 |
| 13 | 998 |
| 14 | 999 |
| 15 | 6999 |
| 16 | 7899 |
| 17 | 7989 |
| 18 | 7998 |
| 19 | 7999 |
| 20 | 8799 |
| 21 | 8889 |
| 22 | 8898 |
| 23 | 8899 |
| 24 | 8979 |
| 25 | 8988 |
| 26 | 8989 |
| 27 | 8997 |
| 28 | 8998 |
| 29 | 8999 |
| 30 | 9699 |
| 31 | 9789 |
| 32 | 9798 |
| 33 | 9799 |
| 34 | 9879 |
| 35 | 9888 |
| 36 | 9889 |
| 37 | 9897 |
| 38 | 9898 |
| 39 | 9899 |
| 40 | 9969 |
| 41 | 9978 |
| 42 | 9979 |
| 43 | 9987 |
| 44 | 9988 |
| 45 | 9989 |
| 46 | 9996 |