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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 36 |
| 3 | 595 |
| 4 | 11385 |
| 5 | 237006 |
| 6 | 5212064 |
| 7 | 119126865 |
| 8 | 2801765835 |
| 9 | 67365151700 |
| 10 | 1648369018296 |
| 11 | 40914062713953 |
| 12 | 1027625691201200 |
| 13 | 26069631471224820 |
| 14 | 667024542735629400 |
| 15 | 17193066926119888716 |
| 16 | 446028709678732029135 |
| 17 | 11636873606948476550895 |
[1,3,36,595,11385,237006,5212064,119126865, 2801765835,67365151700,1648369018296, 40914062713953,1027625691201200,26069631471224820, 667024542735629400,17193066926119888716, 446028709678732029135,11636873606948476550895] |