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 | 2 |
| 2 | 17 |
| 3 | 36 |
| 4 | 305 |
| 5 | 646 |
| 6 | 5473 |
| 7 | 11592 |
| 8 | 98209 |
| 9 | 208010 |
| 10 | 1762289 |
| 11 | 3732588 |
| 12 | 31622993 |
| 13 | 66978574 |
| 14 | 567451585 |
| 15 | 1201881744 |
| 16 | 10182505537 |
| 17 | 21566892818 |
| 18 | 182717648081 |
| 19 | 387002188980 |
| 20 | 3278735159921 |
| 21 | 6944472508822 |