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 | 2 |
| 2 | 4 |
| 3 | 2188 |
| 4 | 5798 |
| 5 | 113634 |
| 6 | 310572 |
| 7 | 6536382 |
| 8 | 18199284 |
| 9 | 25669818476 |
| 10 | 73007772802 |
| 11 | 114988706524270 |
| 12 | 330931069469828 |
| 13 | 556704809728838604 |
| 14 | 1614282136160911722 |
| 15 | 39532221379621112004 |
| 16 | 114956499435014161638 |
| 17 | 2837208756709314025578 |
| 18 | 8270140811590103129028 |
| 19 | 14996791899280244858336604 |