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) |
|---|---|
| 2 | -1 |
| 3 | -1 |
| 4 | 5 |
| 5 | 25 |
| 6 | 70 |
| 7 | 154 |
| 8 | 294 |
| 9 | 510 |
| 10 | 825 |
| 11 | 1265 |
| 12 | 1859 |
| 13 | 2639 |
| 14 | 3640 |
| 15 | 4900 |
| 16 | 6460 |
| 17 | 8364 |
| 18 | 10659 |
| 19 | 13395 |
| 20 | 16625 |
| 21 | 20405 |
| 22 | 24794 |
| 23 | 29854 |
| 24 | 35650 |
| 25 | 42250 |
| 26 | 49725 |
| 27 | 58149 |
| 28 | 67599 |
| 29 | 78155 |
| 30 | 89900 |
| 31 | 102920 |
| 32 | 117304 |
| 33 | 133144 |
| 34 | 150535 |
| 35 | 169575 |
| 36 | 190365 |
| 37 | 213009 |
| 38 | 237614 |
| 39 | 264290 |
| 40 | 293150 |
| 41 | 324310 |
| 42 | 357889 |
| 43 | 394009 |
| 44 | 432795 |
| 45 | 474375 |