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 | 1 |
| 2 | 3 |
| 3 | 25 |
| 4 | 201 |
| 5 | 6979 |
| 6 | 233727 |
| 7 | 31262125 |
| 8 | 4103802933 |
| 9 | 2141080094839 |
| 10 | 1107896230202475 |
| 11 | 2284899650399760961 |
| 12 | 4697484584102406799521 |
| 13 | 38572957675399837886746123 |
| 14 | 316392839278535985537956881623 |
| 15 | 10375350180532286630209934837828053 |