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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 17 |
| 6 | 36 |
| 7 | 80 |
| 8 | 176 |
| 9 | 403 |
| 10 | 910 |
| 11 | 2128 |
| 12 | 4896 |
| 13 | 11628 |
| 14 | 27132 |
| 15 | 65208 |
| 16 | 153824 |
| 17 | 373175 |
| 18 | 888030 |
| 19 | 2170740 |
| 20 | 5202600 |
| 21 | 12797265 |
| 22 | 30853680 |
| 23 | 76292736 |
| 24 | 184863168 |
| 25 | 459162452 |
| 26 | 1117370696 |
| 27 | 2786017120 |
| 28 | 6804995008 |
| 29 | 17024247304 |
| 30 | 41717833740 |
| 31 | 104673837384 |
[1,2,4,8,17,36,80,176,403,910,2128,4896,11628, 27132,65208,153824,373175,888030,2170740,5202600, 12797265,30853680,76292736,184863168,459162452, 1117370696,2786017120,6804995008,17024247304, 41717833740,104673837384] |