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 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 36 |
| 4 | 169 |
| 5 | 576 |
| 6 | 2304 |
| 7 | 7396 |
| 8 | 25600 |
| 9 | 79524 |
| 10 | 250000 |
| 11 | 737881 |
| 12 | 2187441 |
| 13 | 6175225 |
| 14 | 17363889 |
| 15 | 47320641 |
| 16 | 127622209 |
| 17 | 336135556 |
| 18 | 876219201 |
| 19 | 2240128900 |
| 20 | 5666777284 |
| 21 | 14112014436 |
| 22 | 34772925625 |
| 23 | 84554753089 |
| 24 | 203576025636 |
| 25 | 484461937089 |
| 26 | 1142215875025 |
| 27 | 2665572144964 |
| 28 | 6166451098756 |