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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 0 |
| 5 | 2 |
| 6 | 1 |
| 7 | 5 |
| 8 | 4 |
| 9 | 15 |
| 10 | 14 |
| 11 | 48 |
| 12 | 49 |
| 13 | 159 |
| 14 | 173 |
| 15 | 540 |
| 16 | 616 |
| 17 | 1869 |
| 18 | 2211 |
| 19 | 6565 |
| 20 | 7994 |
| 21 | 23335 |
| 22 | 29092 |
| 23 | 83756 |
| 24 | 106489 |
| 25 | 303093 |
| 26 | 391815 |
| 27 | 1104490 |
| 28 | 1448313 |
| 29 | 4049108 |
| 30 | 5375784 |
| 31 | 14922313 |
| 32 | 20028144 |
| 33 | 55248554 |
| 34 | 74869485 |
| 35 | 205394737 |
| 36 | 280737471 |
| 37 | 766396430 |
| 38 | 1055627409 |
| 39 | 2869157740 |
| 40 | 3979545798 |
| 41 | 10773488687 |
| 42 | 15037617603 |