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 | 2 |
| 3 | 20 |
| 4 | 114 |
| 5 | 434 |
| 6 | 1296 |
| 7 | 3268 |
| 8 | 7282 |
| 9 | 14762 |
| 10 | 27778 |
| 11 | 49210 |
| 12 | 82944 |
| 13 | 134078 |
| 14 | 209154 |
| 15 | 316406 |
| 16 | 466034 |
| 17 | 670488 |
| 18 | 944784 |
| 19 | 1306830 |
| 20 | 1777778 |
| 21 | 2382392 |
| 22 | 3149442 |
| 23 | 4112108 |
| 24 | 5308416 |
| 25 | 6781684 |
| 26 | 8580994 |
| 27 | 10761680 |
| 28 | 13385842 |
| 29 | 16522870 |
| 30 | 20250000 |
| 31 | 24652880 |