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 | 341 |
| 2 | 2701 |
| 3 | 721801 |
| 4 | 721801 |
| 5 | 42702661 |
| 6 | 1112103541 |
| 7 | 2380603501 |
| 8 | 5202153001 |
| 9 | 17231383261 |
| 10 | 251994268081 |
| 11 | 1729579597021 |
| 12 | 55181730338101 |
| 13 | 142621888086541 |
| 14 | 242017633321201 |
| 15 | 242017633321201 |
| 16 | 242017633321201 |
| 17 | 1174858593838021 |
| 18 | 1174858593838021 |
| 19 | 168562580058457201 |
| 20 | 790489610041255741 |
| 21 | 790489610041255741 |
| 22 | 790489610041255741 |