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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 32 |
| 2 | 154 |
| 3 | 578 |
| 4 | 2542 |
| 5 | 11242 |
| 6 | 51004 |
| 7 | 234168 |
| 8 | 1086342 |
| 9 | 5078522 |
| 10 | 23889964 |
| 11 | 112953048 |
| 12 | 536316184 |
| 13 | 2555650688 |
| 14 | 12215701582 |
| 15 | 58545624238 |
| 16 | 281245522518 |
| 17 | 1353858728442 |
| 18 | 6529181968828 |
| 19 | 31539774822672 |
| 20 | 152581524133232 |
[1,32,154,578,2542,11242,51004,234168,1086342, 5078522,23889964,112953048,536316184,2555650688, 12215701582,58545624238,281245522518, 1353858728442,6529181968828,31539774822672, 152581524133232] |