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 | 8 |
| 2 | 52 |
| 3 | 340 |
| 4 | 2224 |
| 5 | 14548 |
| 6 | 95164 |
| 7 | 622504 |
| 8 | 4072036 |
| 9 | 26636740 |
| 10 | 174241072 |
| 11 | 1139777284 |
| 12 | 7455717772 |
| 13 | 48770692552 |
| 14 | 319027694548 |
| 15 | 2086881784180 |
| 16 | 13651089405616 |
| 17 | 89296980486772 |
| 18 | 584125595190556 |
| 19 | 3820988224873576 |
| 20 | 24994540788543364 |
| 21 | 163498820845182820 |