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) |
|---|---|
| 0 | 1 |
| 1 | 17 |
| 2 | 153 |
| 3 | 986 |
| 4 | 5134 |
| 5 | 22967 |
| 6 | 91528 |
| 7 | 332741 |
| 8 | 1121864 |
| 9 | 3550518 |
| 10 | 10644516 |
| 11 | 30446116 |
| 12 | 83554915 |
| 13 | 221028152 |
| 14 | 565733446 |
| 15 | 1405559677 |
| 16 | 3398860779 |
| 17 | 8018057345 |
| 18 | 18489507853 |
| 19 | 41750241112 |
| 20 | 92455892640 |
| 21 | 201066321781 |
| 22 | 429927351485 |
| 23 | 904832464581 |
| 24 | 1876192580514 |
| 25 | 3836193955660 |
| 26 | 7740691696577 |