The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 9 |
| 3 | 27 |
| 4 | 135 |
| 5 | 944 |
| 6 | 5264 |
| 7 | 29888 |
| 8 | 50624 |
| 9 | 203391 |
| 10 | 3290624 |
| 11 | 6082047 |
| 12 | 32535999 |
| 13 | 326481920 |
| 14 | 3274208000 |
| 15 | 6929459199 |
| 16 | 72523096064 |
| 17 | 37694578688 |
| 18 | 471672487935 |
| 19 | 11557226700800 |
| 20 | 54386217385983 |
| 21 | 50624737509375 |
| 22 | 275892612890624 |
| 23 | 4870020829413375 |
| 24 | 68091093855502335 |
| 25 | 2280241934368767 |
| 26 | 809386931759611904 |
| 27 | 519017301463269375 |
[2,9,27,135,944,5264,29888,50624,203391,3290624, 6082047,32535999,326481920,3274208000,6929459199, 72523096064,37694578688,471672487935, 11557226700800,54386217385983,50624737509375, 275892612890624,4870020829413375, 68091093855502335,2280241934368767, 809386931759611904,519017301463269375] |