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 | 7 |
| 1 | 151 |
| 2 | 10501 |
| 3 | 1005001 |
| 4 | 100050001 |
| 5 | 10000500001 |
| 6 | 1000005000001 |
| 7 | 100000050000001 |
| 8 | 10000000500000001 |
| 9 | 1000000005000000001 |
| 10 | 100000000050000000001 |
| 11 | 10000000000500000000001 |