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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 512 |
| 4 | 262144 |
| 5 | 134348544 |
| 6 | 68786454528 |
| 7 | 35218798673920 |
| 8 | 18032024921047040 |
| 9 | 9232396828183582208 |
| 10 | 4726987176064286720000 |
| 11 | 2420217434180064678903808 |
| 12 | 1239151326300193115598749696 |
| 13 | 634445479065716907074042200064 |
[1,1,512,262144,134348544,68786454528, 35218798673920,18032024921047040, 9232396828183582208,4726987176064286720000, 2420217434180064678903808, 1239151326300193115598749696, 634445479065716907074042200064] |