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 | 62 |
| 3 | 470 |
| 4 | 3506 |
| 5 | 25838 |
| 6 | 188642 |
| 7 | 1367150 |
| 8 | 9849986 |
| 9 | 70629518 |
| 10 | 504484322 |
| 11 | 3591856430 |
| 12 | 25505792066 |
| 13 | 180717326798 |
| 14 | 1278081981602 |
| 15 | 9024938035310 |
| 16 | 63644751231746 |
| 17 | 448334368529678 |
| 18 | 3155267239152482 |
| 19 | 22188430630735790 |