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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 3 |
| 4 | 16 |
| 5 | 67 |
| 6 | 204 |
| 7 | 546 |
| 8 | 1268 |
| 9 | 2714 |
| 10 | 5348 |
| 11 | 9965 |
| 12 | 17580 |
| 13 | 29781 |
| 14 | 48520 |
| 15 | 76660 |
| 16 | 117624 |
| 17 | 176196 |
| 18 | 257976 |
| 19 | 370503 |
| 20 | 522456 |
| 21 | 725175 |
| 22 | 991540 |
| 23 | 1337974 |
| 24 | 1782924 |
| 25 | 2349438 |
| 26 | 3063164 |
| 27 | 3955601 |
| 28 | 5061524 |
| 29 | 6423017 |
| 30 | 8086224 |
| 31 | 10106280 |
| 32 | 12543280 |
| 33 | 15468232 |
| 34 | 18958128 |
| 35 | 23103051 |
| 36 | 28000224 |
| 37 | 33762411 |
| 38 | 40510812 |
| 39 | 48384906 |
| 40 | 57534052 |