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| n | a(n) |
|---|---|
| 0 | 6 |
| 1 | 30 |
| 2 | 174 |
| 3 | 1158 |
| 4 | 8742 |
| 5 | 74046 |
| 6 | 696750 |
| 7 | 7219974 |
| 8 | 81762438 |
| 9 | 1005151902 |
| 10 | 13336264686 |
| 11 | 189992451270 |
| 12 | 2893180308774 |
| 13 | 46904155833918 |
| 14 | 806663460996462 |
| 15 | 14669947577257926 |
| 16 | 281298999630211590 |
| 17 | 5672559830998316574 |
| 18 | 120014233288249367598 |
| 19 | 2658221288671765756422 |
[6,30,174,1158,8742,74046,696750,7219974,81762438, 1005151902,13336264686,189992451270,2893180308774, 46904155833918,806663460996462,14669947577257926, 281298999630211590,5672559830998316574, 120014233288249367598,2658221288671765756422] |