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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 514 |
| 3 | 19686 |
| 4 | 262148 |
| 5 | 1953130 |
| 6 | 10077702 |
| 7 | 40353614 |
| 8 | 134217736 |
| 9 | 387420498 |
| 10 | 1000000010 |
| 11 | 2357947702 |
| 12 | 5159780364 |
| 13 | 10604499386 |
| 14 | 20661046798 |
| 15 | 38443359390 |
| 16 | 68719476752 |
| 17 | 118587876514 |
| 18 | 198359290386 |
| 19 | 322687697798 |
| 20 | 512000000020 |
| 21 | 794280046602 |
| 22 | 1207269217814 |
| 23 | 1801152661486 |
| 24 | 2641807540248 |
[0,2,514,19686,262148,1953130,10077702,40353614, 134217736,387420498,1000000010,2357947702, 5159780364,10604499386,20661046798,38443359390, 68719476752,118587876514,198359290386, 322687697798,512000000020,794280046602, 1207269217814,1801152661486,2641807540248] |