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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 77 |
| 3 | 351 |
| 4 | 1274 |
| 5 | 3914 |
| 6 | 10569 |
| 7 | 25728 |
| 8 | 57486 |
| 9 | 119483 |
| 10 | 233389 |
| 11 | 431886 |
| 12 | 762007 |
| 13 | 1288587 |
| 14 | 2097472 |
| 15 | 3298033 |
| 16 | 5024460 |
| 17 | 7435284 |
| 18 | 10710609 |
| 19 | 15046642 |
| 20 | 20647290 |
| 21 | 27712842 |
| 22 | 36426054 |
| 23 | 46936280 |
| 24 | 59342609 |
| 25 | 73677240 |
| 26 | 89890517 |
| 27 | 107839121 |
[1,12,77,351,1274,3914,10569,25728,57486,119483, 233389,431886,762007,1288587,2097472,3298033, 5024460,7435284,10710609,15046642,20647290, 27712842,36426054,46936280,59342609,73677240, 89890517,107839121] |