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 | 7 |
| 4 | 30 |
| 5 | 142 |
| 6 | 502 |
| 7 | 1519 |
| 8 | 3828 |
| 9 | 9145 |
| 10 | 18966 |
| 11 | 38562 |
| 12 | 70202 |
| 13 | 127954 |
| 14 | 211261 |
| 15 | 357465 |
| 16 | 549988 |
| 17 | 875942 |
| 18 | 1273587 |
| 19 | 1941522 |
| 20 | 2705012 |
| 21 | 3966472 |
| 22 | 5325916 |
| 23 | 7599591 |
| 24 | 9892052 |
| 25 | 13772034 |
| 26 | 17476435 |
| 27 | 23770735 |
| 28 | 29625591 |
| 29 | 39617904 |
| 30 | 48129046 |
| 31 | 63654183 |
| 32 | 76396024 |