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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 2 |
| 3 | 2 |
| 4 | 6 |
| 5 | 20 |
| 6 | 14 |
| 7 | 32 |
| 8 | 90 |
| 9 | 72 |
| 10 | 80 |
| 11 | 230 |
| 12 | 80 |
| 13 | 560 |
| 14 | 740 |
| 15 | 1542 |
| 16 | 1782 |
| 17 | 450 |
| 18 | 828 |
| 19 | 2562 |
| 20 | 3936 |
| 21 | 12474 |
| 22 | 9288 |
| 23 | 10224 |
| 24 | 16022 |
| 25 | 11088 |
| 26 | 31034 |
| 27 | 53972 |
| 28 | 92372 |
[2,2,2,6,20,14,32,90,72,80,230,80,560,740,1542, 1782,450,828,2562,3936,12474,9288,10224,16022, 11088,31034,53972,92372] |