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 | 12 |
| 4 | 54 |
| 5 | 260 |
| 6 | 1310 |
| 7 | 6821 |
| 8 | 36413 |
| 9 | 198227 |
| 10 | 1096259 |
| 11 | 6141764 |
| 12 | 34784432 |
| 13 | 198828308 |
| 14 | 1145544680 |
| 15 | 6645621536 |
| 16 | 38786564126 |
| 17 | 227585926704 |
| 18 | 1341757498470 |
| 19 | 7944249448686 |
| 20 | 47217102715624 |
| 21 | 281615520373954 |
| 22 | 1684957401786580 |
| 23 | 10110628493454482 |
| 24 | 60830401073611514 |