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 | 5 |
| 2 | 15 |
| 3 | 51 |
| 4 | 115 |
| 5 | 151 |
| 6 | 511 |
| 7 | 1115 |
| 8 | 1151 |
| 9 | 1511 |
| 10 | 5111 |
| 11 | 11115 |
| 12 | 11151 |
| 13 | 11511 |
| 14 | 15111 |
| 15 | 51111 |
| 16 | 111115 |
| 17 | 111151 |
| 18 | 111511 |
| 19 | 115111 |
| 20 | 151111 |
| 21 | 511111 |
| 22 | 1111115 |
| 23 | 1111151 |
| 24 | 1111511 |
| 25 | 1115111 |
| 26 | 1151111 |
| 27 | 1511111 |
| 28 | 5111111 |
| 29 | 11111115 |
| 30 | 11111151 |
| 31 | 11111511 |
| 32 | 11115111 |
| 33 | 11151111 |
| 34 | 11511111 |