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| n | a(n) |
|---|---|
| 1 | 36 |
| 2 | 576 |
| 3 | 1296 |
| 4 | 3600 |
| 5 | 9216 |
| 6 | 24336 |
| 7 | 63504 |
| 8 | 166464 |
| 9 | 435600 |
| 10 | 1140624 |
| 11 | 2985984 |
| 12 | 7817616 |
| 13 | 20466576 |
| 14 | 53582400 |
| 15 | 140280336 |
| 16 | 367258896 |
| 17 | 961496064 |
| 18 | 2517229584 |
| 19 | 6590192400 |
| 20 | 17253347904 |
| 21 | 45169851024 |
| 22 | 118256205456 |
| 23 | 309598765056 |
| 24 | 810540090000 |
[36,576,1296,3600,9216,24336,63504,166464,435600, 1140624,2985984,7817616,20466576,53582400, 140280336,367258896,961496064,2517229584, 6590192400,17253347904,45169851024,118256205456, 309598765056,810540090000] |