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 | 0 |
| 1 | 2 |
| 2 | 1026 |
| 3 | 59052 |
| 4 | 1048580 |
| 5 | 9765630 |
| 6 | 60466182 |
| 7 | 282475256 |
| 8 | 1073741832 |
| 9 | 3486784410 |
| 10 | 10000000010 |
| 11 | 25937424612 |
| 12 | 61917364236 |
| 13 | 137858491862 |
| 14 | 289254654990 |
| 15 | 576650390640 |
| 16 | 1099511627792 |
| 17 | 2015993900466 |
| 18 | 3570467226642 |
| 19 | 6131066257820 |
| 20 | 10240000000020 |
| 21 | 16679880978222 |
| 22 | 26559922791446 |