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 | 6 |
| 4 | 6 |
| 5 | 6 |
| 6 | 36 |
| 7 | 66 |
| 8 | 96 |
| 9 | 266 |
| 10 | 576 |
| 11 | 1026 |
| 12 | 2246 |
| 13 | 4866 |
| 14 | 9516 |
| 15 | 19598 |
| 16 | 41286 |
| 17 | 83526 |
| 18 | 170048 |
| 19 | 351378 |
| 20 | 716850 |
| 21 | 1458098 |
| 22 | 2984028 |
| 23 | 6087270 |
| 24 | 12380900 |
| 25 | 25224222 |
| 26 | 51356400 |
| 27 | 104380510 |
| 28 | 212164362 |
| 29 | 431148222 |
| 30 | 875353220 |
| 31 | 1776567762 |
| 32 | 3604752672 |
| 33 | 7310374010 |
| 34 | 14819370480 |
| 35 | 30033014994 |