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 | 143 |
| 6 | 7855 |
| 7 | 153311 |
| 8 | 1505465 |
| 9 | 9729830 |
| 10 | 47235703 |
| 11 | 186615092 |
| 12 | 630338668 |
| 13 | 1882894541 |
| 14 | 5092130575 |
| 15 | 12686490993 |
| 16 | 29498296651 |
| 17 | 64664954532 |
| 18 | 134715649055 |
| 19 | 268438970166 |
| 20 | 514318521438 |
| 21 | 951646716171 |
| 22 | 1706721390223 |
| 23 | 2976056379875 |
| 24 | 5058962536429 |
| 25 | 8402677784738 |
| 26 | 13663807273607 |