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 | 5 |
| 3 | 49 |
| 4 | 205 |
| 5 | 5269 |
| 6 | 5369 |
| 7 | 266681 |
| 8 | 1077749 |
| 9 | 9778141 |
| 10 | 1968329 |
| 11 | 239437889 |
| 12 | 240505109 |
| 13 | 40799043101 |
| 14 | 40931552621 |
| 15 | 205234915681 |
| 16 | 822968714749 |
| 17 | 238357395880861 |
| 18 | 238820721143261 |
| 19 | 86364397717734821 |
| 20 | 17299975731542641 |
| 21 | 353562301485889 |
| 22 | 354019312583809 |
| 23 | 187497409728228241 |