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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 8 |
| 3 | 22 |
| 4 | 52 |
| 5 | 112 |
| 6 | 228 |
| 7 | 442 |
| 8 | 832 |
| 9 | 1516 |
| 10 | 2720 |
| 11 | 4754 |
| 12 | 8264 |
| 13 | 14000 |
| 14 | 23824 |
| 15 | 39318 |
| 16 | 66052 |
| 17 | 106282 |
| 18 | 177884 |
| 19 | 277936 |
| 20 | 469384 |
| 21 | 703924 |
| 22 | 1225052 |
| 23 | 1718226 |
| 24 | 3203156 |
| 25 | 3974696 |
| 26 | 8551248 |
| 27 | 8307370 |
| 28 | 23950704 |
| 29 | 13195606 |
| 30 | 72779892 |
| 31 | -1798186 |
| 32 | 246605280 |
| 33 | -165440790 |
| 34 | 935635244 |
| 35 | -1166043794 |
| 36 | 3896720688 |
| 37 | -6470965954 |
| 38 | 17297466660 |
| 39 | -33101156302 |
| 40 | 79718300900 |
| 41 | -163586078926 |
[0,2,8,22,52,112,228,442,832,1516,2720,4754,8264, 14000,23824,39318,66052,106282,177884,277936, 469384,703924,1225052,1718226,3203156,3974696, 8551248,8307370,23950704,13195606,72779892, -1798186,246605280,-165440790,935635244, -1166043794,3896720688,-6470965954,17297466660, -33101156302,79718300900,-163586078926] |