| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 49 |
| 3 | 343 |
| 4 | 2401 |
| 5 | 16807 |
| 6 | 117649 |
| 7 | 823543 |
| 8 | 5764801 |
| 9 | 40353607 |
| 10 | 282475249 |
| 11 | 1977326743 |
| 12 | 13841287201 |
| 13 | 96889010407 |
| 14 | 678223072849 |
| 15 | 4747561509943 |
| 16 | 33232930569601 |
| 17 | 232630513987207 |
| 18 | 1628413597910449 |
| 19 | 11398895185373143 |
| 20 | 79792266297612001 |
| 21 | 558545864083284007 |
[1,7,49,343,2401,16807,117649,823543,5764801, 40353607,282475249,1977326743,13841287201, 96889010407,678223072849,4747561509943, 33232930569601,232630513987207,1628413597910449, 11398895185373143,79792266297612001, 558545864083284007] |