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| n | a(n) |
|---|---|
| 1 | 3705 |
| 2 | 7085 |
| 3 | 14119 |
| 4 | 30681 |
| 5 | 86575 |
| 6 | 249953 |
| 7 | 747735 |
| 8 | 2652785 |
| 9 | 9085231 |
| 10 | 30632409 |
| 11 | 117322423 |
| 12 | 424882145 |
| 13 | 1490248815 |
| 14 | 5857018745 |
| 15 | 21643873159 |
| 16 | 77054809761 |
| 17 | 305865631855 |
| 18 | 1139590008233 |
| 19 | 4082296717095 |
| 20 | 16272461979425 |
| 21 | 60842958745471 |
[3705,7085,14119,30681,86575,249953,747735, 2652785,9085231,30632409,117322423,424882145, 1490248815,5857018745,21643873159,77054809761, 305865631855,1139590008233,4082296717095, 16272461979425,60842958745471] |