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 | 2 |
| 3 | 10 |
| 4 | 25 |
| 5 | 137 |
| 6 | 346 |
| 7 | 1906 |
| 8 | 4817 |
| 9 | 26545 |
| 10 | 67090 |
| 11 | 369722 |
| 12 | 934441 |
| 13 | 5149561 |
| 14 | 13015082 |
| 15 | 71724130 |
| 16 | 181276705 |
| 17 | 998988257 |
| 18 | 2524858786 |
| 19 | 13914111466 |
| 20 | 35166746297 |
| 21 | 193798572265 |
| 22 | 489809589370 |
| 23 | 2699265900242 |
| 24 | 6822167504881 |
| 25 | 37595924031121 |
| 26 | 95020535478962 |