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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 363 |
| 3 | 275 |
| 4 | 2048 |
| 5 | 4772 |
| 6 | 18992 |
| 7 | 76642 |
| 8 | 364922 |
| 9 | 1991487 |
| 10 | 11850372 |
| 11 | 74391348 |
| 12 | 486418706 |
| 13 | 3257213385 |
| 14 | 22149432404 |
| 15 | 152046330078 |
| 16 | 1049873091893 |
| 17 | 7276150005243 |
| 18 | 50546516116050 |
| 19 | 351666937737820 |
| 20 | 2449012961612884 |
[21,363,275,2048,4772,18992,76642,364922,1991487, 11850372,74391348,486418706,3257213385, 22149432404,152046330078,1049873091893, 7276150005243,50546516116050,351666937737820, 2449012961612884] |