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 | 4 |
| 4 | 41 |
| 5 | 244 |
| 6 | 1029 |
| 7 | 3485 |
| 8 | 9926 |
| 9 | 25030 |
| 10 | 57126 |
| 11 | 120570 |
| 12 | 238330 |
| 13 | 446344 |
| 14 | 797825 |
| 15 | 1370684 |
| 16 | 2274259 |
| 17 | 3660612 |
| 18 | 5734776 |
| 19 | 8771181 |
| 20 | 13127940 |
| 21 | 19270240 |
| 22 | 27789713 |
| 23 | 39435814 |
| 24 | 55142010 |
| 25 | 76066910 |
| 26 | 103627784 |
| 27 | 139554142 |
| 28 | 185929971 |
| 29 | 245260890 |
| 30 | 320527585 |
| 31 | 415268815 |