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) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 8 |
| 3 | 18 |
| 4 | 40 |
| 5 | 70 |
| 6 | 132 |
| 7 | 210 |
| 8 | 352 |
| 9 | 540 |
| 10 | 840 |
| 11 | 1232 |
| 12 | 1848 |
| 13 | 2626 |
| 14 | 3780 |
| 15 | 5280 |
| 16 | 7392 |
| 17 | 10098 |
| 18 | 13860 |
| 19 | 18620 |
| 20 | 25080 |
| 21 | 33264 |
| 22 | 44088 |
| 23 | 57730 |
| 24 | 75600 |
| 25 | 97900 |
| 26 | 126672 |
| 27 | 162540 |
| 28 | 208208 |
| 29 | 264770 |
| 30 | 336240 |
| 31 | 424204 |
| 32 | 534336 |
| 33 | 669438 |
| 34 | 837080 |
| 35 | 1041810 |
| 36 | 1294344 |
| 37 | 1601138 |
| 38 | 1977140 |
| 39 | 2432430 |
| 40 | 2987040 |
| 41 | 3655806 |