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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 4 |
| 6 | 0 |
| 7 | 1 |
| 8 | 20 |
| 9 | 84 |
| 10 | 0 |
| 11 | 4 |
| 12 | 56 |
| 13 | 220 |
| 14 | 560 |
| 15 | 0 |
| 16 | 10 |
| 17 | 120 |
| 18 | 455 |
| 19 | 1140 |
| 20 | 2300 |
| 21 | 0 |
| 22 | 20 |
| 23 | 220 |
| 24 | 816 |
| 25 | 2024 |
| 26 | 4060 |
| 27 | 7140 |
| 28 | 0 |
| 29 | 35 |
| 30 | 364 |
| 31 | 1330 |
| 32 | 3276 |
| 33 | 6545 |
| 34 | 11480 |
| 35 | 18424 |
| 36 | 0 |
| 37 | 56 |
| 38 | 560 |
| 39 | 2024 |
| 40 | 4960 |
| 41 | 9880 |
| 42 | 17296 |
| 43 | 27720 |
| 44 | 41664 |
| 45 | 0 |
| 46 | 84 |
| 47 | 816 |
| 48 | 2925 |
| 49 | 7140 |
| 50 | 14190 |
| 51 | 24804 |
| 52 | 39711 |
| 53 | 59640 |
| 54 | 85320 |