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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 4 |
| 5 | 6 |
| 6 | 4 |
| 7 | 2 |
| 8 | 8 |
| 9 | 28 |
| 10 | 56 |
| 11 | 71 |
| 12 | 68 |
| 13 | 94 |
| 14 | 228 |
| 15 | 497 |
| 16 | 808 |
| 17 | 1044 |
| 18 | 1352 |
| 19 | 2316 |
| 20 | 4608 |
| 21 | 8264 |
| 22 | 12592 |
| 23 | 17717 |
| 24 | 26968 |
| 25 | 47044 |
| 26 | 83912 |
| 27 | 138417 |
| 28 | 211052 |
| 29 | 319850 |
| 30 | 517356 |
| 31 | 881918 |
| 32 | 1483336 |
| 33 | 2377252 |
| 34 | 3700648 |
| 35 | 5853067 |
| 36 | 9605596 |
| 37 | 15991378 |
| 38 | 26154700 |
| 39 | 41734433 |
| 40 | 66214096 |
[0,0,0,1,4,6,4,2,8,28,56,71,68,94,228,497,808, 1044,1352,2316,4608,8264,12592,17717,26968,47044, 83912,138417,211052,319850,517356,881918,1483336, 2377252,3700648,5853067,9605596,15991378,26154700, 41734433,66214096] |