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 | 1 |
| 2 | 12 |
| 3 | 23 |
| 4 | 155 |
| 5 | 408 |
| 6 | 2113 |
| 7 | 6601 |
| 8 | 29844 |
| 9 | 102455 |
| 10 | 430739 |
| 11 | 1557744 |
| 12 | 6295873 |
| 13 | 23431057 |
| 14 | 92685660 |
| 15 | 350427287 |
| 16 | 1369969547 |
| 17 | 5224669704 |
| 18 | 20294334721 |
| 19 | 77765701465 |
| 20 | 301003383396 |
| 21 | 1156426099511 |
| 22 | 4467463316867 |
| 23 | 17188150411488 |