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 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 9 |
| 8 | 124 |
| 9 | 1300 |
| 10 | 11316 |
| 11 | 89513 |
| 12 | 660978 |
| 13 | 4658738 |
| 14 | 31711638 |
| 15 | 210332227 |
| 16 | 1367416232 |
| 17 | 8752773288 |
| 18 | 55343303064 |
| 19 | 346540112781 |
| 20 | 2153037307846 |
| 21 | 13292835205606 |
| 22 | 81652655795106 |
| 23 | 499484899831775 |
| 24 | 3045117929546220 |
| 25 | 18513208314957356 |
| 26 | 112297592929814292 |
| 27 | 679900657841661529 |
| 28 | 4110073054119135194 |
| 29 | 24814158520762637754 |