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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 124 |
| 3 | 1646 |
| 4 | 25962 |
| 5 | 384758 |
| 6 | 5833286 |
| 7 | 88309448 |
| 8 | 1329981026 |
| 9 | 20064521716 |
| 10 | 303052845328 |
| 11 | 4574664964317 |
| 12 | 69036523371066 |
| 13 | 1042057567199143 |
| 14 | 15729900331335344 |
| 15 | 237425764865409042 |
| 16 | 3583655555859630532 |
[4,124,1646,25962,384758,5833286,88309448, 1329981026,20064521716,303052845328,4574664964317, 69036523371066,1042057567199143,15729900331335344, 237425764865409042,3583655555859630532] |