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 | 10 |
| 2 | 41 |
| 3 | 174 |
| 4 | 737 |
| 5 | 3122 |
| 6 | 13225 |
| 7 | 56022 |
| 8 | 237313 |
| 9 | 1005274 |
| 10 | 4258409 |
| 11 | 18038910 |
| 12 | 76414049 |
| 13 | 323695106 |
| 14 | 1371194473 |
| 15 | 5808472998 |
| 16 | 24605086465 |
| 17 | 104228818858 |
| 18 | 441520361897 |
| 19 | 1870310266446 |
| 20 | 7922761427681 |
| 21 | 33561355977170 |
| 22 | 142168185336361 |
| 23 | 602234097322614 |