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 | 1 |
| 3 | 5 |
| 4 | 15 |
| 5 | 35 |
| 6 | 75 |
| 7 | 140 |
| 8 | 259 |
| 9 | 435 |
| 10 | 735 |
| 11 | 1155 |
| 12 | 1841 |
| 13 | 2765 |
| 14 | 4200 |
| 15 | 6125 |
| 16 | 8975 |
| 17 | 12731 |
| 18 | 18179 |
| 19 | 25235 |
| 20 | 35180 |
| 21 | 48055 |
| 22 | 65681 |
| 23 | 88299 |
| 24 | 118895 |
| 25 | 157690 |
| 26 | 209230 |
| 27 | 274510 |
| 28 | 359779 |
| 29 | 466970 |
| 30 | 605740 |
| 31 | 778860 |
| 32 | 1000462 |
| 33 | 1276044 |
| 34 | 1624845 |
| 35 | 2056355 |
| 36 | 2598855 |
| 37 | 3265851 |
| 38 | 4097763 |
| 39 | 5117350 |