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 | 7 |
| 3 | 46 |
| 4 | 310 |
| 5 | 2131 |
| 6 | 14797 |
| 7 | 103216 |
| 8 | 721420 |
| 9 | 5046661 |
| 10 | 35316787 |
| 11 | 247187986 |
| 12 | 1730227330 |
| 13 | 12111325591 |
| 14 | 84778481977 |
| 15 | 593446982356 |
| 16 | 4154121702040 |
| 17 | 29078830390921 |
| 18 | 203551748166367 |
| 19 | 1424862043454326 |
| 20 | 9974033723049550 |
| 21 | 69818234317954651 |
| 22 | 488727634995505957 |