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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 352 |
| 3 | 9909 |
| 4 | 107776 |
| 5 | 698125 |
| 6 | 12045817 |
| 7 | 37679104 |
| 8 | 103495401 |
| 9 | 584190541 |
| 10 | 2487920149 |
| 11 | 15207694336 |
| 12 | 25846158097 |
| 13 | 68520305701 |
| 14 | 367691205289 |
| 15 | 766959765625 |
| 16 | 1513188079677 |
| 17 | 2846113596901 |
| 18 | 5135516500321 |
| 19 | 6803021627392 |
| 20 | 24650159312557 |
| 21 | 61346708983561 |
| 22 | 93685639700269 |
| 23 | 206700247118737 |
| 24 | 299545983486001 |
[1,352,9909,107776,698125,12045817,37679104, 103495401,584190541,2487920149,15207694336, 25846158097,68520305701,367691205289,766959765625, 1513188079677,2846113596901,5135516500321, 6803021627392,24650159312557,61346708983561, 93685639700269,206700247118737,299545983486001] |