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 | 8 |
| 4 | 260 |
| 5 | 2728 |
| 6 | 16428 |
| 7 | 70792 |
| 8 | 242856 |
| 9 | 706048 |
| 10 | 1809464 |
| 11 | 4199064 |
| 12 | 8992684 |
| 13 | 18024072 |
| 14 | 34170724 |
| 15 | 61784632 |
| 16 | 107243472 |
| 17 | 179645376 |
| 18 | 291667440 |
| 19 | 460615272 |
| 20 | 709686228 |
| 21 | 1069477928 |
| 22 | 1579767068 |
| 23 | 2291594536 |
| 24 | 3269684088 |
| 25 | 4595235136 |