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 | 1 |
| 2 | 6 |
| 3 | 41 |
| 4 | 372 |
| 5 | 4077 |
| 6 | 53106 |
| 7 | 795645 |
| 8 | 13536360 |
| 9 | 257055705 |
| 10 | 5400196830 |
| 11 | 124170067665 |
| 12 | 3104906420700 |
| 13 | 83818724048325 |
| 14 | 2431059231544650 |
| 15 | 75354930324303525 |
| 16 | 2486926158748693200 |
| 17 | 87036225272850632625 |
| 18 | 3220532233879435917750 |
| 19 | 125594424461427237941625 |