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 | 8 |
| 2 | 25 |
| 3 | 70 |
| 4 | 225 |
| 5 | 748 |
| 6 | 2401 |
| 7 | 7668 |
| 8 | 24649 |
| 9 | 79344 |
| 10 | 255025 |
| 11 | 819494 |
| 12 | 2634129 |
| 13 | 8467464 |
| 14 | 27217089 |
| 15 | 87483296 |
| 16 | 281199361 |
| 17 | 903867144 |
| 18 | 2905317801 |
| 19 | 9338615022 |
| 20 | 30017295025 |
| 21 | 96485195716 |
| 22 | 310134268609 |
| 23 | 996870677460 |
| 24 | 3204261102025 |
| 25 | 10299519778080 |
| 26 | 33105949765729 |
| 27 | 106413107836334 |