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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 4 |
| 8 | 83 |
| 9 | 454 |
| 10 | 5761 |
| 11 | 17998 |
| 12 | 334796 |
| 13 | 777107 |
| 14 | 10574991 |
| 15 | 52611728 |
| 16 | 342198939 |
| 17 | 1094122103 |
| 18 | 18448004164 |
| 19 | 38504610244 |
| 20 | 538330828006 |
| 21 | 2215487105213 |
| 22 | 16330536692133 |
| 23 | 45407723468330 |