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 | 1 |
| 3 | 0 |
| 4 | 14 |
| 5 | 1 |
| 6 | 0 |
| 7 | 36 |
| 8 | 78 |
| 9 | 1 |
| 10 | 0 |
| 11 | 24 |
| 12 | 978 |
| 13 | 252 |
| 14 | 1 |
| 15 | 0 |
| 16 | 0 |
| 17 | 4320 |
| 18 | 8730 |
| 19 | 620 |
| 20 | 1 |
| 21 | 0 |
| 22 | 0 |
| 23 | 8460 |
| 24 | 103820 |
| 25 | 46890 |
| 26 | 1290 |
| 27 | 1 |
| 28 | 0 |
| 29 | 0 |
| 30 | 7560 |
| 31 | 581700 |
| 32 | 1159340 |
| 33 | 185430 |
| 34 | 2394 |
| 35 | 1 |
| 36 | 0 |
| 37 | 0 |
| 38 | 2520 |
| 39 | 1767360 |
| 40 | 13387570 |
| 41 | 8314880 |
| 42 | 595476 |
| 43 | 4088 |
| 44 | 1 |
| 45 | 0 |
| 46 | 0 |
| 47 | 0 |
| 48 | 3087000 |
| 49 | 85806000 |
| 50 | 170429490 |
| 51 | 44341584 |
| 52 | 1642788 |
| 53 | 6552 |
| 54 | 1 |