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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 6 |
| 5 | 8 |
| 6 | 28 |
| 7 | 42 |
| 8 | 162 |
| 9 | 262 |
| 10 | 1076 |
| 11 | 1828 |
| 12 | 7852 |
| 13 | 13820 |
| 14 | 61388 |
| 15 | 110954 |
| 16 | 505878 |
| 17 | 933458 |
| 18 | 4345660 |
| 19 | 8152860 |
| 20 | 38608380 |
| 21 | 73424650 |
| 22 | 352686780 |
| 23 | 678390116 |
| 24 | 3298016912 |
| 25 | 6405031050 |
| 26 | 31461151108 |
| 27 | 61606881612 |
| 28 | 305327366988 |
| 29 | 602188541928 |
| 30 | 3007925909860 |
| 31 | 5969806669034 |
[2,1,2,2,6,8,28,42,162,262,1076,1828,7852,13820, 61388,110954,505878,933458,4345660,8152860, 38608380,73424650,352686780,678390116,3298016912, 6405031050,31461151108,61606881612,305327366988, 602188541928,3007925909860,5969806669034] |