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 | 6 |
| 1 | 19 |
| 2 | 85 |
| 3 | 457 |
| 4 | 2641 |
| 5 | 15649 |
| 6 | 93505 |
| 7 | 560257 |
| 8 | 3360001 |
| 9 | 20156929 |
| 10 | 120935425 |
| 11 | 725600257 |
| 12 | 4353576961 |
| 13 | 26121412609 |
| 14 | 156728377345 |
| 15 | 940370067457 |
| 16 | 5642220011521 |
| 17 | 33853319282689 |
| 18 | 203119914123265 |
| 19 | 1218719481593857 |
| 20 | 7312316883271681 |
| 21 | 43873901287047169 |
| 22 | 263243407697117185 |