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 | 2 |
| 5 | 12 |
| 6 | 46 |
| 7 | 140 |
| 8 | 344 |
| 9 | 732 |
| 10 | 1400 |
| 11 | 2468 |
| 12 | 4080 |
| 13 | 6404 |
| 14 | 9632 |
| 15 | 13980 |
| 16 | 19688 |
| 17 | 27020 |
| 18 | 36264 |
| 19 | 47732 |
| 20 | 61760 |
| 21 | 78708 |
| 22 | 98960 |
| 23 | 122924 |
| 24 | 151032 |
| 25 | 183740 |
| 26 | 221528 |
| 27 | 264900 |
| 28 | 314384 |
| 29 | 370532 |
| 30 | 433920 |
| 31 | 505148 |
| 32 | 584840 |
| 33 | 673644 |
| 34 | 772232 |
| 35 | 881300 |
| 36 | 1001568 |
| 37 | 1133780 |
| 38 | 1278704 |
| 39 | 1437132 |