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) |
|---|---|
| 16 | 1 |
| 17 | 27 |
| 18 | 172 |
| 19 | 798 |
| 20 | 2866 |
| 21 | 8879 |
| 22 | 24308 |
| 23 | 60812 |
| 24 | 140884 |
| 25 | 306890 |
| 26 | 633610 |
| 27 | 1250265 |
| 28 | 2370223 |
| 29 | 4339340 |
| 30 | 7699607 |
| 31 | 13286899 |
| 32 | 22357092 |
| 33 | 36771118 |
| 34 | 59229576 |
| 35 | 93604439 |
| 36 | 145353364 |
| 37 | 222087798 |
| 38 | 334273110 |
| 39 | 496164369 |
| 40 | 726946124 |
| 41 | 1052222818 |