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 | 1 |
| 1 | 5 |
| 2 | 41 |
| 3 | 217 |
| 4 | 953 |
| 5 | 3961 |
| 6 | 16121 |
| 7 | 65017 |
| 8 | 261113 |
| 9 | 1046521 |
| 10 | 4190201 |
| 11 | 16769017 |
| 12 | 67092473 |
| 13 | 268402681 |
| 14 | 1073676281 |
| 15 | 4294836217 |