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 | 101 |
| 3 | 677 |
| 4 | 28901 |
| 5 | 3422501 |
| 6 | 4884101 |
| 7 | 260176901 |
| 8 | 4784488901 |
| 9 | 5887492901 |
| 10 | 7370222501 |
| 11 | 12898144901 |
| 12 | 14498568101 |
| 13 | 24840912101 |
| 14 | 38514062501 |
| 15 | 47563248101 |
| 16 | 56249608901 |
| 17 | 64014060101 |
| 18 | 110842384901 |
| 19 | 123657722501 |
| 20 | 135755402501 |
| 21 | 205145584901 |
| 22 | 279343960901 |
| 23 | 288680544101 |