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 | 50 |
| 2 | 216 |
| 3 | 868 |
| 4 | 3492 |
| 5 | 13976 |
| 6 | 56472 |
| 7 | 225880 |
| 8 | 897624 |
| 9 | 3590576 |
| 10 | 14471600 |
| 11 | 57886120 |
| 12 | 229868968 |
| 13 | 919477136 |
| 14 | 3706264464 |
| 15 | 14825053488 |
| 16 | 58832739632 |
| 17 | 235330977088 |
| 18 | 948740144448 |
| 19 | 3794960504136 |
| 20 | 15061020431688 |
| 21 | 60244082031104 |