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 | 7 |
| 2 | 202 |
| 3 | 4900 |
| 4 | 112046 |
| 5 | 2490132 |
| 6 | 54442636 |
| 7 | 1177912344 |
| 8 | 25302706734 |
| 9 | 540709469284 |
| 10 | 11509659737732 |
| 11 | 244254583041960 |
| 12 | 5170993925895980 |
| 13 | 109258058984867592 |
| 14 | 2304778527410416728 |
| 15 | 48552885599587471920 |