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 | 1 |
| 2 | 5 |
| 3 | 16 |
| 4 | 61 |
| 5 | 225 |
| 6 | 841 |
| 7 | 3136 |
| 8 | 11705 |
| 9 | 43681 |
| 10 | 163021 |
| 11 | 608400 |
| 12 | 2270581 |
| 13 | 8473921 |
| 14 | 31625105 |
| 15 | 118026496 |
| 16 | 440480881 |
| 17 | 1643897025 |
| 18 | 6135107221 |
| 19 | 22896531856 |
| 20 | 85451020205 |
| 21 | 318907548961 |
| 22 | 1190179175641 |
| 23 | 4441809153600 |
| 24 | 16577057438761 |