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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | 4 |
| 4 | 12 |
| 5 | 12 |
| 6 | 40 |
| 7 | 28 |
| 8 | 84 |
| 9 | 87 |
| 10 | 164 |
| 11 | 110 |
| 12 | 456 |
| 13 | 200 |
| 14 | 536 |
| 15 | 700 |
| 16 | 1150 |
| 17 | 592 |
| 18 | 2304 |
| 19 | 978 |
| 20 | 3756 |
| 21 | 3164 |
| 22 | 4004 |
| 23 | 2508 |
| 24 | 12592 |
| 25 | 5871 |
| 26 | 9740 |
| 27 | 12036 |
| 28 | 22302 |
| 29 | 9128 |
| 30 | 44824 |
[0,0,2,4,12,12,40,28,84,87,164,110,456,200,536, 700,1150,592,2304,978,3756,3164,4004,2508,12592, 5871,9740,12036,22302,9128,44824] |