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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 15 |
| 7 | 30 |
| 8 | 48 |
| 9 | 80 |
| 10 | 135 |
| 11 | 270 |
| 12 | 396 |
| 13 | 792 |
| 14 | 1296 |
| 15 | 2016 |
| 16 | 2688 |
| 17 | 5376 |
| 18 | 7344 |
| 19 | 14688 |
| 20 | 20520 |
| 21 | 30400 |
| 22 | 48000 |
| 23 | 96000 |
| 24 | 121440 |
| 25 | 170016 |
| 26 | 266112 |
| 27 | 338688 |
| 28 | 458640 |
| 29 | 917280 |
| 30 | 1166400 |
| 31 | 2332800 |
| 32 | 2764800 |
| 33 | 3932160 |
| 34 | 6082560 |
| 35 | 8211456 |
| 36 | 9797760 |
| 37 | 19595520 |
| 38 | 30233088 |
| 39 | 42550272 |
[0,1,2,4,8,15,30,48,80,135,270,396,792,1296,2016, 2688,5376,7344,14688,20520,30400,48000,96000, 121440,170016,266112,338688,458640,917280,1166400, 2332800,2764800,3932160,6082560,8211456,9797760, 19595520,30233088,42550272] |