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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 8 |
| 3 | 52 |
| 4 | 492 |
| 5 | 64132 |
| 6 | 800048 |
| 7 | 137270956 |
| 8 | 1860277044 |
| 9 | 357975249028 |
| 10 | 1036802293087624 |
| 11 | 15013817846943908 |
| 12 | 47192717955016924592 |
| 13 | 10360599532897359064120 |
| 14 | 154361699651715243559788 |
| 15 | 34589385964790856394651396 |
| 16 | 118349529407778329236413352408 |
| 17 | 412825418773807104132857739017404 |
[4,8,52,492,64132,800048,137270956,1860277044, 357975249028,1036802293087624,15013817846943908, 47192717955016924592,10360599532897359064120, 154361699651715243559788, 34589385964790856394651396, 118349529407778329236413352408, 412825418773807104132857739017404] |